Attention: Mangaviewer is dead.
I found this cool new scanlation site where you can read some manga's online. The list of manga hosted in this site are:666 Satan, Beck, Bleach, Chobits, Death Note, Elfen leid, Flame of Recca, Full Metal Alchemist, Gantz, Hikaru no Go, Hunter x Hunter, Monster, Naruto, One Piece, Prince of tennis, Saiyuki, Shaman King, Slam Dunk, Tenjo Tenge, Trigun, Yuyu Hakusho.
Quite an amazing selection that you can read in the office--during lunch break, of course. Hehehe.
Click here to visit the site.