Whimsyload

Artwork by game artist Rodney Alan Greenblat
http://www.whimsyload.com/

Neoseeker's Um Jammer Lammy Resources

Offers FAQs, screenshots, a discussion board, and links to reviews.
http://www.neoseeker.com/Games/Products/PSX/umjammerlammy/umjammerlammy_cheats.html

Anime Lyrics: Um Jammer Lammy lyrics

Lyrics from the "Make it Sweet!" album, most of which come from the game itself.
http://www.animelyrics.com/game/umjammerlammy/

Elfwood FanQuarter: fan art by Sarah Guilbeaux

Um Jammer Lammy fan art drawn by Sarah Guilbeaux. Mostly pictures of Teriyaki Ono, with a few of Lammy, Rammy and Parappa.
http://elfwood.lysator.liu.se/fanq/g/u/guilbeaux2/

Pink Milk and Munchies BBS

An English language bulletin board for discussing Um Jammer Lammy. Includes fan art and fan stories.
http://pub86.ezboard.com/bpinkmilk

Level 80

Contains various hints for the game.
http://www.level80.co.uk/psun.htm

Um Jammer Lammy

Official Sony of America page. Flash-based site with character biographies, screenshots and an overview of how the game works.
http://www.us.playstation.com/games/scus-94448.asp