Just recently got a dreamcast and I love this thing. I randomly picked it up, the seller threw it in when I was purchasing a fight stick that I could use on my ps2/ps3...the stick also works with the dreamcast.
So far I have picked up a VGA cable and SF double impact, Marvel vs Capcom 1 and 2, Capcom vs SNK, bass fishing, and tennis...
I love the tennis game! If you know of any place the sells games let me know...I bought SF Alpha 3 off of ebay and the seller sent me the PS2 version!