cran.us.r-project.org is back online again as an alias of
cran.mirrors.pair.com
If you do not get a response from http://cran.us.r-project.org you can
try http://cran.mirrors.pair.com instead.
Our thanks to the good people at pair.com who provide the facilities
for this mirror.
--
Douglas Bates bates at stat.wisc.edu
Statistics Department 608/262-2598
University of Wisconsin - Madison http://www.stat.wisc.edu/~bates/