Argh the opening song is retarded.
Also, some edits that I noticed pretty easily.

1) In episode 2, they changed the riceballs the little girl gave to Zoro into cookies. What is up with that? (Oh and when Zoro eats it after the badguy totally smushed it, one cookie is still intact)
2) They pronounced Zoro's name, "Zolo". Now, I know that Japanese language has that weird L and R thingy, but Zoro makes more sense when you consider that he is a swordsmaster.
3) Oh yeah, no blood and the fight scenes were slaughted.
4) They edited out "Marines" and put in "Navy".

OMG, I hope there are uncut DVDs...