yeah, a compatibility site would be great. also .. just kind of a "look at all the great games you are missing out on!!" site - something tailored specifically for the GP32 and it's emu's. A lot of us around here have a general idea of what some of the more well-known games are to be played for GPengine, castaway, frodo, SMS + NES emu's, etc - but there are soooo many for those systems who've been lost to the ages, and they're all scattered across the internet. And on these boards you always hear banter about this obscure game or that, but generally there's no kinda screenshot or idea of what the game's about, so it's pretty easy to dismiss.. I wish some uber-retrogame nerd would just plumb the depths and amass a huge easy-to-digest collection of lots of little screenshots and writeups, (of course compatibility with the GP32 emu's being a factor) - man that would be cool, it would actually make a few people forget about the damn '...where's the genesis emulator!' shit for five minutes and want to exploit all the crap we already HAVE but aren't even aware of...
that being said, you should all concern yourselves with Rolling Thunder + Castlevania 3 for NES, Crackdown for Castaway, and Legendary Axe, Volfied and Galaga 90 for GPEngine