for ds would be new super mario bros and any sonic game. for psp a good one is prinny can i be your hero
There's a new DS one called Ivy the Kiwi or something like that. I haven't played it yet, but read in a review that it was an interesting platformer with some touch screen controls too. Kiwi will just keep running and you'll have to alter it's coarse by constructing vines and swinging it around. The art was really pretty. It seem targeted at kids though, but you can check it out for yourself. Also, Megaman Zero. There's a pack with all 3 or 4 of it released recently for the DS.
LocoRoco/LocoRoco 2 might be a platformer. Not sure. It's more like that Fluidity Wiiware game except you're controlling a giant round chicken thing, so I guess it's what you're asking for...