I like how the video player changes size when you scroll allowing you to change the size on the fly (I got a really a really big monitor so I always have to resize videos). But I'm wondering if you could tweak it so the video scrolls separately from the playlist, that way if you're watching a video near the bottom of the playlist the video can still be whatever size you want it to be. basically how playlist have their own scroll bar on Youtube.
Also I was wondering if there was a more efficient way to have people say where they where donating towards. Having to look through all those PMs sounds like a lot of unnecessary work on your part. You could have a button in the donations page that allows people to donate towards specific things, or for even less work you could just put poll up on the front page.
And lastly, donations have been becoming a more and more integral part of the site, so put up a link on the front page for donations. I mean it doesn't have to be huge or anything, but have it somewhere near the top of the screen and maybe about the same size as the upload button, or put it in the toolbar so it can be reached no matter what page you're on.