I don't think you PSP people get it in about a year the types of games we will see on DS will be very very different from anything we ever played.
Launch games won't be mind blowing since devs just wanted to jump in at the start, but think of the next waves of games, give devs 18-24 months to come up with something very special and the PSP will just be another PS2 with nothing new, while the DS will move into gaming we never seen.