You can also watch movies, i actually watched 2 elfen lied episodes on my psp in the job xD, i has dvd quality movie, i know cos i have a demo disc with some movie trailers, you just need a video converter.
You can on the DS too.
Additionally, your initial posts about the awesome FMV intros - well - they can also be played on the DS. In fact, there was an awesome FMV intro for the DS FF.
The only real comparison is game quality (not quantity!) vs hardware capability.
The facts are that the PSP has the better hardware, but like it or not, the quality - and potential - of DS games is superior.
I lost my DS in a taxi. I have no carts for it. Which of the two should I buy?
Im thinking DS all over again - because when I play, I want the freedom to play for 12 hours without changing batteries, and I want the ability to play from over 30 great games without lugging disks around with me.
When I want to play games with awesome graphics engines, ill just turn on my home console or computer. But when im out and about, I want to be able to flip the lid closed and save my state for another couple of days - without rushing to plug it into the charger when i get home.
Thats why the DS owns the PSP.