[jlu]

I agree with Yuusuke, if you like Samurai Champloo you'll probably like comedy+action mangas like Rave Master and Fairy Tail (both by the same mangaka, but if you ask, I think Fairy Tail is better)

As for mainstream shounen mangas like Naruto and Bleach, I'd recommend D.Grayman, One Piece, and FMA (Full Metal Alchemist)

If you like lighthearted borderline ridiculous school mangas like Love Hina, give School Rumble a shot too