Me too, I just love that game, Best Ds game imo

I find myself playing it everyday since I bought it 

Pokemon Pearl/Diamond(This game rules)
New Super Mario Bros(if you like 2D platformers is a must buy)
Jump Ultimate Stars(Import it from Japan, Smash Bros meet the Manga!!!!!)
Mario & Luigi: Partners in Time(Good RPG, good history)
Mario Kart DS(Is Mario Kart)
Elite Beat Agents(Warning: Very hard game)
Mario & Sonic at the Olympiq games(Very fun and challenging)

Picross DS & The World Ends With You**

** Get it or I'll kill you

K, these all seem like good recommendations.

Oh yeah, the Minish Cap is also on my list of must haves.

Feel free to recommend any other GBA games as well. This is my first handheld since the GBC.

The World Ends With You and Professor Layton.

The only DS I find worth buying. ; )

It will take me forever to recommend games. Instead I'm just going to tell you to look at my ds games in my collection.

 lack of zelda = fail  >=(

Congrats on your DS purchase. I just got rid of mine.

for gba try the metroid games and golden sun 1&2

Club House Games. Great replay value...