I have a PSP and a DS lite (sold my original DS, was able to get it for more then usual because of some special thing, and it was on the last day ) and I have to say, the DS is more fun. The PSP was fun at first, but it really died down. Don't see any adertising for it, no games. I got a few more days use of it when I downgraded, but the fun went away quick.
I haven't used my PSP for gaming much lately, so I need to get more games. However I completely agree with you. My father bought a nintendo ds and it's as if it were a hollow shell! You know when you knock on the wall and there seems to be a hollow area? That's exactly what happens with the DS! I'm not a fanboy, I loved to play mario on the DS, but the PSP you gotta admit looks like it was put more effort in making and actually looks like an electronic. The DS might be fun but I'm not a big fan of fisher price, cause that's the material it looks like it was made of