I just got a DSi(finally I know) and I know some games that I'll be getting(Mario & Luigi games, any Nintendo game, Professor Layton) yet I could still use some more game recommendations. Give me a list of games that I should play for the DS. I'd love some obscure games that I'm forgetting about so please help me!

http://www.giantbomb.com/nintendo-ds/60-52/the-decisive-quality-ds-list/35-243385/#258

Start by taking a look at that list.

All the Ace Attorney stuff. I'm playing through it all right now. It is amazing! 
 
Edit: It is not cheap though. Most of the games go for at least the original retail price still (like $40). Justice For All is harder to get from my experiences so it might cost more. It's worth it though.

PICROSS 3D

Rocket Slime

Hotel Dusk

Strange Journey

All the Castlevania DS games.

Ghost Trick.

Always be Ghost Tricking!

You can play older ds games on the dsi right?

@Phatmac: Yes. The DSi can play all DS games. It just can't play GBA games.

Any Zelda game

Any of the Ouedan / Elite Beat Agent games. If you're a fan of super smash bros and Shounen Jump anime series grab Jump Ultimate Stars.

PICROSS 3D

Any Zelda game

Thanks for the recommendations guys! I'm gonna be playing the Mario & Luigi franchise once again! :D Has anyone played Devil Survivor? That game looks rad.

Dragon Ball Z Attack of the Saiyans was actually pretty good. Also going to throw in Radiant Historia.

@Phatmac said:

Thanks for the recommendations guys! I'm gonna be playing the Mario & Luigi franchise once again! :D Has anyone played Devil Survivor? That game looks rad.

both devil survivors and strange journey are great, so try those definitely.

Nintendo Gamer's Top 50 list

http://www.nintendo-gamer.net/2012/02/04/top-50-ds-games/

Gamesradar's list

http://www.gamesradar.com/best-ds-games/

kotaku's list top 12 list

http://kotaku.com/5878896/the-12-best-games-for-the-ds

PCWorld's top 15 list

http://www.pcworld.com/article/243585/the_15_best_ds_games.html

NintendoWorldReport's top 30 list

http://www.nintendoworldreport.com/feature/26080

IGN's top 25 list

http://www.ign.com/articles/2012/08/08/the-top-25-nintendo-ds-games-2

@Animasta: Thanks!

@awadnin: Thank you!