So in case any of you weren't already aware, about an hour (or a little more) ago,
megaupload and all megaupload links were taken down by the FBI of the US.The site is down for good and the FBI made several arrests (the owners/founders of the site).
There are already many youtube videos out talking about this as well (although some of them incorrectly blame SOPA/PIPA).
SOPA/PIPA have not been voted on or passed yet so it is solely the responsibility of the FBI for taking this site down.
*EDIT*
AnonOps has already apparently taken a keen interest in this as
www.justice.gov has gone down several times since then. I think they are attacking such sites as well as the FBI sites and will probably continue / escalate this activity.