Ditto. I would personally use XviD or DivX if I had to.

I really don't like the QT player on Windows. I've not tried it on a Mac which apparently is much better however. But it's still nothing against the hatred I've got against Real Player

For some reason I can never actually uninstall QT properly and it's made Windows flakey before. Also everybody seems to want to use their own ancient version of QT and insist on installing it as well.

I've got nothing against the actual codec itself as it's reasonably good quality for the bitrate and when it does work then it's fine. But it's just the useless player application that gets installed.