Ripped 275 wallpapers from gamewallpapers*com, all in psp format (480×272)
Previews:
Download:
http://rapidshare.com/files/95718639/psportablewalls275.rar
Say thanks if you like it 
UPDATE!! Uploaded another 390 wallpapers in PSP format from the same site:
Preview:
Download:
http://rapidshare.com/files/96778804/psportablewalls386.rar
PS I uploaded also a lot of other wallpapers from this site in 1680×1050 (cyberbabes section). Downloadable here:
http://rapidshare.com/files/95026275/achtergrondjes1680.rar