While creating levels is possible in both the PS3 and PSP version, the PSP controls make things a little more complicated in the portable version of Little Big Planet. The game, like its big-brother version, has a decent story going on for it, with regular level progression and item collecting. But the placement of stickers was so painful - to have to hold the L2 trigger button while rotating AND scaling the sticker using only the analog stick? That is beyond annoying.
So this is why this game will only receive my playthrough attention. I'll leave the level creation to its PS3 counterpart, where it's easier to share levels anyways.