Joshua,
it's is always risky to give recommendations, but I have also learned much
from
[1] Myatt: Open Source Solutions - R. 
(a free brief introduction to using the R environment in Rich Text (.RTF) and 
Acrobat (PDF) formats and including sample data written by Mark Myatt 
<mark at myatt.demon.co.uk>, available at
http://www.myatt.demon.co.uk/Rex1031.zip )
[2] P. Dalgaard: Introductory Statistics with R. Springer 2002. 
    ISBN 0-387-95475-9
[3] J. Fox: An R and S-plus Companion to Applied Regression. Sage 2002.
    ISBN 0-7619-2280-6
Take a look and happy R'ing
Wolfgang
--
Wolfgang Lindner                           Lindner at math.uni-duisburg.de
   Gerhard-Mercator-Universitaet Duisburg  Tel: +49 0203 379-1326