I noticed this handy little game in the PSP section in my local Xtravison, I have the PS3 version with NO downloaded content. Is it worth "buying" LBP PSP from www.pspisoz.com?
Since it's just a download away, why not play it? The PSP version is LBP with just two depth of field's (I really don't know what to call them) as opposed to 3 on the PS3. It also has a new single player, which is what you'll be playing a lot considering you can't play any levels online (I don't think). Other than that and the graphics downgrade, not much of a difference.
Both the psp and ps3 have downloadable content such as levels, skins etc... I think it's just a portable version, and before you ask...no idea if this can connect with the ps3 one.