Xtrakt (Originally for the Sony X1, can be ported to the HD2. A 3d 1st person shooter while on a speeding motorcycle game. Works very well on the HD despite the game not supporting multi touch, almost makes the game better because you have to take one finger thats being used to steer the bike off the screen and then tap with the other finger to shoot. It does make it a tiny bit more challenging, but doesn't take away from the game at all. I don't know if the Xperia supported multi touch, I don't think it did, so this is how you're supposed to play the game anyway)
Electopia (3rd party software, demo available online. You control a robot with multiple weapons through a tropical Caribbean wasteland taking out his enemies...I think...very wierd game, good graphics though, very unique control system with the multi touch screen)
Experiment 13 (strategy platform game. A 3rd person side scroller with a twist...again, like both others, the graphics are stunning and this game really shows off the HD2's graphics capabilities)
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These are the 3 best games out for the HD2 right now, I'll post screenshots and links if people are interested in the thread. The HD2 has some pretty good looking games, def. way better looking than any iPhone game I've played by far.
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Anybody with other games is encouraged to post them here.
Note: I haven't found any games that use the accelerometer yet.