Anime Lyrics: Lyrics from the album "Make it Sweet!". Most of the songs come from the game itself.
GameSpot - Review: Review, by Jeff Gerstmann: "If you didn't play Parappa to death and love every minute of it, you might as well skip out on Um Jammer Lammy." [Score: 8.4 out of 10]
IGN - Review: Review, by Um Jay Boor Lammy: "So if you enjoyed Parappa the Rapper, then yes, this is a must have." [Score: 8.6 out of 10]
Sony: Official site. Provides information on the game, and a gallery.