So, I just started the client and clicked on generate coins. Errr...seems to simple. What am I missing? My computer now is a phenom II x6 1075t with a 6850
You'll need another piece of software to mine with your GPU.
I personally use Kiv's GUI miner - http://bitcointalk.org/index.php?topic=3878.0
Youll have to configure that depending on what pool your using (or going solo).
The bitcoin client doesnt (necessarily) have to be present on your mining rig, so that button you pressed to generate coins in basically solo mining with your CPU (youll probably never see any payout from that).