Every story has a beginning.. and mine starts with the classic consoles. From Atari, NES, to Gen. Odd how things worked out, from blips to characters sprawling over an open world. Either by pipe or a loop-de-loop. Those times have passed, but still are a part of our gamer hearts.
Well my playlist thus far.. Pitfall, Pac-Man, Super Mario Bros 1-3, Castlevania, Sonic the Hedgehog, Phantasy Star, Final Fantasy, Metroid, Earthworm Jim, Mega Man, and many more.. this list could take awhile trust me.
Apart from the D-toid family, I'm also a part of the AllGames Community, and the fun show Distributed Failure
http://www.distributedfailure.com/
Also try:
Retro Game Challenge (if you like good things)
Advance Wars Dual Strike (if you're a strategy fan)
Mario Kart DS (if you enjoy the karting)
Chrono Trigger DS (depending on whether you've played Chrono Trigger or not)
There are a ton of other worthwhile DS games (I own a sea of them), but I'll stop there. Enjoy your new portable!