I've rolled up R-1.5.1.tgz a short while ago. This is a patch upgrade,
fixing the most important bugs that cropped up after the 1.5.0 release.
A set of recommended packages which have been tested with R-1.5.1 has
been bundled up. Binary distributions should include these packages.
You can get the files from the developer site
ftp://cvs.r-project.org/pub/CRAN/src/base/R-1.5.1.tgz
ftp://cvs.r-project.org/pub/CRAN/src/base/R-1.5.1-recommended.tgz
or
http://cran.us.r-project.org/src/base/R-1.5.1.tgz
http://cran.us.r-project.org/src/base/R-1.5.1-recommended.tgz
or wait for them to be mirrored at a CRAN site near you. Binaries for
various platforms will appear in due course.
There are also versions split for floppies and a patch file against 1.5.0.
        For the R Core Team,
        Peter D.
 NOTE: I discovered late in the release process that there is still a
 small problem with the 8.0.x tcl/tk compatibility. A fix is
 forthcoming.
Here's the relevant part of the NEWS file:
		CHANGES IN R VERSION 1.5.1
NEW FEATURES
    o	Enhancements to mathematical annotation of plots:
	- expressions involving dot(<something>) now produce a dot accent
	  above the <something> (initial patch from Ben Bolker).
	- within an expression, the symbol partialdiff is now converted
	  to a partial differential symbol (greek delta).
    o	smooth.spline() has a new argument `nknots' allowing to set the
	default number of knots (when `all.knots = FALSE' as per default).
BUG FIXES
    o	Rdconv now skips CRs in input files, even on Unix.
    o	readBin() had a (very slow) memory leak if changing size or reading
	character strings.  writeChar() had a memory leak.
    o	polygon() and rect() with lty = "blank" were omitting the fill
	colour (if present).  symbols(circles=, lty="blank") was
	drawing the border of the disks.
    o	Subsetting non-existent rows in a data frame would produce
	missing row names, which are not allowed.
    o	On Unix, R_PAPERSIZE was set to '' instead of 'a4' as
default on
	systems without paperconf.
    o	Under GNOME, capabilities() now reports correctly that X11, png
	and jpeg are available (if they are under X11).
    o	The names of some results of unlist() had the wrong internal
	length, which confused paste().	 Both have been corrected. (PR#1524)
    o	RweaveLatex.Rd had unbalanced braces in section "Supported
	Options".
    o	merge() with multiple and differently-named match columns
	failed. (PR#1510)
    o	NAs in right-justified unquoted character matrices were being
	mis-aligned.  This mainly affected printing data frames.
    o	predict.*bSpline() bugs extrapolating for deriv >= 1 (PR#1473),
	and predict.[bn]s bug e.g. for bs(x), reported by Ch.Sangiorgio.
    o	qr.X was failing if n < p.  Fixed, but only in the case when
	pivoting does not occur. (PR#1519)
    o	xx[, 1:3] was returning a list if xx had only one row, even
	though xx[1, 1:3] was a data frame. (PR#1530)
    o	nls() was reporting incorrectly the number of iterations if the
	maximum was reached.
    o	rbind.data.frame() was coercing logical columns to factors.
	(PR#1536)
    o	Rprof(NULL) or Rprof("") called when not profiling caused a
	segfault: now silently ignored.	 (PR#1471)
    o	On systems (e.g. Windows) using R's own code for expm1, the
	values were wrong for large negative x, and this affected
	pweibull(), for example.
    o	prettyNum(*, bigmark=*) added extra marks in some cases. (PR#1548)
    o	cut.dendrogram() failed in some cases. (PR#1552)
    o	The links in refman.pdf were broken by a single invalid
	\alias{}. Now Rdconv checks more comprehensively. (PR#1550)
    o	predict(smooth.spline(x,*), deriv =1) did not predict at all `x'
	values, and
	smooth.spline(x,*, all.knots = TRUE) used much too much memory
	when length(x) was largish.
	smooth.spline(*, .... trace = TRUE ..) is a bit more self-explaining.
    o	pexp(x, log=TRUE) and pweibull(*) were losing precision for large x.
    o	Workaround for NetBSD bug in compiling dounzip.c. (PR#1565/6)
    o	Conversions to numeric in type.convert were always treating "NA"
as
	missing whatever the setting of na.strings. (PR#1568)
    o	R CMD check now deals correctly with package names containing a
	'.' in the Depends field of a DESCRIPTION file. (PR#1591)
    o	pbinom() and pbinom() were misssing the "fuzz" that other
discrete
	distributions have in order to guard against truncation.
    o	The "=" assignment operator behaved as "<<-" in
some constructions
	with composite left-hand sides.
    o	Added print.AsIs() method to ensure "AsIs" objects are printed
	by the method for their real class. (PR#1587)
    o	mosaicplot(*, color = v) now recycles v[] if needed.
    o	Calling dev.control("inhibit") with no graphics device open
	crashed R. (PR#1605)
    o	read.dcf() was not checking that memory allocation succeeded.
    o	The C function fprec might overflow for > 16 digits, showing
	up in example(str) on some platforms.
    o	Changes to the methods package:
	- Nonstandard generic function definitions given to
	  setGeneric now work; these were previously ignored.
	- Classes that extend matrix, etc. as the data part previously lost
	  their attributes.
	- There were bugs in distinguishing methods for "missing" from
	  methods for "ANY".
	- Some coerce methods were not selected correctly when the two classes
	  were related by an "is" relation.
	- extends() now works correctly if given a class definition rather
	  than a name.
	- class()<- was leaving in an explicit class attribute for basic data
	  types.
	- Method signatures including arguments following "..." in the
	  argument list of the generic didn't work.
    o	par(mgp = v) now allows negative `v' (S-compatibly and sensibly).
    o	identify.hclust() masked its `x' argument and so failed.
    o	System rint was never being used in fround.c.
    o	round/trunc.POSIXt were erroneously retaining information on
	DST. (PR#1543)
    o	tcltk package didn't work with tcl8.0.x.  Compatibility code
	inserted (PR#1640, thanks to Ren? Bertin for helping out with
	this).
    o	selfStart() {pkg "nls"} now works again when parameter names are
	not specified (but implicit).
    o	legend() now treats lty="0" properly (as solid).
    o	ARMAacf was failing if 0 < p < q+1: it failed to say that ar needed
	to be padded with zeroes, and now the code does that.
    o	old.packages() was assuming a bundle was installed in only one
	library, and so update.packages() would only update a bundle
	in the first location in lib.loc.
    o	fisher.test() could miscalculate odds ratio and confidence
	interval for tables with large entries, due to numerical
	overflow.
    o	Using lty = "1" (or "10") does no longer produce
invalid
	postscript or pdf.  Using "0" in a character lty is currently not
	implemented device-independently and needs more fixing.
    o	ccf(plot = FALSE) was returning a spurious extra 0 at lag 0.
    o	On console-based versions of R (Windows, GNOME, probably
	MacOS) warning/error messages longer than 8192 chars could
	crash R. (PR#1651)
    o	Comparisons between objects of mode "call" using "=="
now return
	TRUE if both sides deparse to the same string (as always intended).
    o	HoltWinters() now initializes correctly in the exponential
	smoothing case, and plot.HoltWinters() allows lty to be set.
    o	fisher.test() crashed due to corruption on some large
	problems.  It also crashed on tables with total one. (PR#1662)
    o	The substitution code for strptime (used e.g. on Windows)
	cached the month names and so did not recognise locale changes
	during an R session, as used by get.hist.quote{tseries}.
	Caching has been supressed.  (PR#1116)
    o	Some functions used the non-existing error() function instead
	of stop().
    o	vector("complex",n)  doesn't return random garbage anymore.
-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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