Chrome/Firefox: If you're a frequenter of sites like Megavideo, Megaupload and Veoh, you're probably annoyed with the constant limitations. Browser extension Illimitux will remove those limitations for you so you can watch video and upload files annoyance-free.
With Illimitux, you can bypass Megavideo's 72 minute watching limit, automatically fill in Megaupload's captcha code, and watch Veoh videos longer than 5 minutes without installing Veoh TV. Just install the browser extension, head over to a limited site like Megavideo, and watch for the Illimitux popup, which will ask you if you want to remove that site's limitation. The first time you hit the button, you'll have to download and install the Cacaoweb plugin when prompted, but after that hitting the "remove limitation" button will lead you to another page where you can view the video in a separate player and watch as much as you want.
Illimitux is a free download, works wherever Chrome and Firefox do.