I don't know how useful this would be for everyone else but it is fucking amazing for me. If you install the GreaseMonkey add on for firefox, and then go here http://userscripts.org/scripts/show/58869 and install that script (greasemonkey will auto install) you will be able to stream megaupload videos in divx player. It has worked for every video I've tried.
Also after that is done this site http://www.icefilms.info/index is just like ninjavideo except it uses that process.
Grease Monkey is so full of win. Will install this script.
On the MozillaZine forums I found/use a user ignore script for message boards. You can ignore any user, threads they start, and even embedded quotes when an ignored user is quoted in a response within a thread. That sold me on Greas Monkey.
Thanks for the link.