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there isn't a difference. its just like the i pods. there is a gen. 1000 a gen. 2000 and a gen 3000. but if ur talking the difference between a psp gen. 3000 or a psp go then the psp go is smaller. u have to have online for it. and u cant buy regular game disks for it.
The PSP 3000 is the third generation of the PSP system, there is also a PSP 2000 (AKA slim). a PSP 1000 (AKA phat). and the PSP go, which is the most recent iteration of the PSP.
There's no physical difference, the number at the end is the PSP's region which will affect what movie UMDs you can play, and some online features such as the PSN. PSP-2000 is the Japanese regional variant, PSP-2001 is the North American.
The two major differences between are: 1. Slim has better battery life 2. Obviously...slim is, well, slimmer =) -Rittyl
There is no difference in the size of the screen between the two models. Both consoles have a 4.3" widescreen TFT LCD screen.