I just got a nintendo DS for my birthday - my publisher got it for me cause I've been such a good boy.
so far I have Zelda and Elite Beat Agents. I might pick up FFIII at some point, and maybe Revenant Wings. What other games are totally awesome? I'm curious about Professor Layton and I wouldn't mind playing the first Phoenix Wright if i can find it.
I've also been playing a lot of amazing indie games for PC. Check these out if you haven't already.
http://www.escapistmagazine.com/content/games/yahtzee/artoftheft
Trilby - the Art of Theft: Kind of a "stealth platformer" where you have to sneak around buildings stealing stuff, avoiding guards, etc. Super-fun with great graphics, although it gets kind of boring/annoying at the end.
http://mightyjilloff.dessgeega.com/
Mighty Jill Off: I just played it this morning. It's a really hard old-school NES-style shortie (i beat it in about 25 minutes). Warning: mild S&M cutscenes at the intro and ending (no nudity). Don't play if your mom is watching.