Just got my hands on my AES, so I'm finally able to play a few games I've wanted for years
Mainly I play Magician Lord to get used to the controlls (which are simply amazing), and eventhough it has its flaws, I simply love it.
I play a bunch of Sengoku when I have friends over. I love that game co-op (singleplayer is also damn good, though). Have a bunch of fighters as well, but I haven't sat Down and gotten sucked into one of them yet, though I really, really enjoy the different planes-mechanic on my Fatal Fury-games (FF2 and FFSpecial), and Samurai Spirits is simply Close.-to-Perfect.
Mainly, I just turn on my NeoGeo whenever I can and I play the first game I can grab. Man, I love this consolle to death