If the want the best technical information Tennisplayer.net is the best and most comprehensive resource availible. If you want to learn to play or improve your game it is best to seek out a good Tennis Instructor*.
*As an Instructor myself some might consider me biased.
Babolat Pure Drive "Black," Pure Drive Play. RPM Blast 16 @ 50lbs.
USPTA Professional, PTR (10 and Under) Certified.