First, just thought I'd better comment on the first review: I hated Ninja Scroll, too much random porn for my liking. Samurai Champloo is, in my opinion, better for action AND isn't so graphic you'll feel embarrassed watching it.
Ninja Scroll comparisons aside, Samurai Champloo is undeniably awesome. Jin, Mugen and Fuu are well thought-out characters, not your one-dimensional heroes at all. The drawing and animation are beautiful without being showy (no CGI here), and the soundtrack is in an amazingly anachronistic hip-hop based style. The storyline is great, and the side-stories which make up most of the series are by turns funny, thought-provoking, gripping and thoroughly enjoyable. To cap it off, the fight scenes are incredible, with Mugen and Jin's contrasting styles creating something slightly different from most samurai anime.
So, great soundtrack, drawing, animation, characters, storyline (and sub-plots), swordplay, humour, and the occasional thought-provoking scene. I couldn't recommend this more!