UPDATE: Anonymous has just taken down the RIAA and MPAA websites as well. Apparently, #OpPayback is a pretty huge operation for the group:
ORIGINAL ARTICLE: Add another major site to the list, as Anonymous has just taken down Universal Music's site. The group also took credit for taking down the Department of Justice's site earlier this afternoon
This is in response to the DOJ / ICE takedown of filesharing site MegaUpload earlier today.
This story is developing...
UPDATE: 5:09 pm EST - A little bit of bragging: