It depends what you are looking for really, The Sunflat games wil keep you addicted for a couple of weeks and they are all free, paper toss is ok for a bit too also try jewels, replica island and poke a mole.
Oh right cool, so just download app "Rombuddy" and install and then download and install gameboid and snesoid and off i go... sounds easy enough lol
So are these the best free or paid games for Desire ??
Check out that link, they've compiled 50 of the best games out there and the list is actually pretty good. It's also been squashed into a tidy little video so you don't have to trawl through page after page of boring screenies!