Using different browsers worked for me when I had to use Megavideo.
I watched 72 minutes of Superbad in Safari, hit the limit, switched over to Opera and watched the rest.
Just move the slider to where you left off.
If you happen to have an old AOL account, logging in and browsing through them acts like a proxy server. I tend to avoid MV when I can, but doing that, I hit the 72m, relog (don't switch SNs), go back and pick up where I left off.
I give up