Kam went on another Karazhan run last night, but let's not talk about that now. I've recently discovered the WeGame.com website, which appears to be a YouTube but for video games. They host vids, but what's more interesting is they provide a free client for Windows which records game videos. So I gave it a spin last night, just briefly.
The quality is reasonable and it was very easy to use; when the client was running a little square appeared in the WoW window, a single hotkey started and stopped recording. It did slow the creaky old PC down a little bit, so I didn't try it on boss fights.
Without further ado, I present (although not really proudly as such) my awesome test footage: