I found this awesome free online basketball game. You pick a forward, center, or guard, and can advance to SG,SF, PF, or PG at level 15 (Centers stay centers). It is 3 on 3 halfcourt, 5 minute games. You get to level up new stats and get new moves, like reverse dunk, backwards 3 pointer, etc. Sign up at: freestyle.sierraonline.com
freestyle is a fun game the problem is when you get to lvl 16 you're usually playing against people that are about 6+ levels over you. which makes you virtually worthless. it's fun as hell if you like / understand basketball though.