Well, I learned how to upload stuff to a PSP. and one of them was one of my desktop wallpapers. And I just got to thinking, whats the best resolution if you wanted to put a wallpaper from the net onto your PSP? And Are there any on MT that I could use that would be right for PSP? Thanks.

The PSP screen resolution is 480x272, so that is your best bet. If you want to use one from MT then you could get it and resize it down to 480x272.