No, I use Firefox. ;) I can't stand IE, and Safari just doesn't have the cool extensions like Firefox does, even though its standards compliance might be slightly better.

I'm on a Mac, but I'm running XP. I seem to get much faster downloads on torrents and newsgroups (600+ Kb/s) on this machine than my PC even in Windows, so I'm not sure why these streaming vids don't want to play smoothly. I've seen it work properly on another machine, and when the connection is high the image quality is great. When the connection isn't as good, the quality gets worse to it can keep up. (Which is what I'm viewing right now and it's STILL choppy.) Oh well.