After spending my first 2 years as a developer using Visual Source Safe I came to realize its many, many short comings. Enter Subversion. This book has proven to be an excellent resource as I've made the transition. It is concise and provides excellent insight into how to effectively use the software. After reading it, it has become a valuable desk reference.

Check it out http://www.amazon.com/exec/obidos/ASIN/0974514063/qid=1113365740/sr=2-1/ref=pd_bbs_b_2_1/104-0330354-5885566