A LocoRoco guide book came out a few days ago here in Japan.

The book contains maps for all 40 of the main levels.

and it contains a couple of pages of stickers.

It's only 900yen (about $8) so if you are stuck finding everything in a level or if you want the stickers head over to your a Japan bookstore or Online bookstore and pickup a copy. (ISBN4-7966-5458-5)

There's also a soundtrack CD coming out on the October 18th.