I have a few games for my Desire HD, and although Angry Birds was okay (kept my son going for a few days before he finished it) the one I and my kids like best so far is Crazy Snowboard, which really uses the motion sensors.
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Rory
MkIIa, blue lit buttons, memory upgrade, 1Tb in Subaru Forester STi
MkII, 240Gb in Mark Lord dock
MkII, 80Gb SSD in dock