i think the recent bunch of ds stuff just doesn't do it compared to iphone gaming, psp gaming and even the up and coming android gaming that should hit soon (supports flash, TONS OF GAMES).
Really? If you are an RPG fan, the DS is the place to be man. I know that many RPG games are kind of niche but I am really happy as a clam with what has already come and is scheduled to come out for the DS RPG wise. I mean, I just got through playing FFIV, Might and Magic COH, Zelda Spirit Tracks, and am currently working through Etrian Odyssey II. After I finish that, I have Professor Layton 2 and Devil Survivor waiting for me. Coming out this year that I am looking forward to are SMT Strange Journey, Dragon Quest 9, Etrian Odyssey III, Dragon Quest Monsters Joker 2, Golden Sun 3, Final Fantasy Gaiden, Pokemon Heart Gold, Dragon Quest 6, Ninokuni Another World and Shiren 4. Don't know how I am gonna manage all that, but I sure as hell am not complaining about a lack of games.
For smaller experiences, I agree that the iPhone has the DS trumped mostly due to volume and price. I play tons of iPhone games, and it is great for that quick fix of gaming. Shooters, Tower Defense games, and even adventure games are great on the iPhone.
As far as the PSP having more than the DS? Well... it gets less play than my DS. I got it for Littlebigplanet which lasted about a week. Other than Valkyria Chronicles 2 an Persona 3 Portable I am not sure what else people are looking forward to with the PSP.