WeGame.Com has been billed on some sites as a sort of YouTube for gamers. The site features a downloadable client that lets you record in-game video and then upload it to the WeGame website.
The site says the client is “as fast as a Zergling rush” and a number of commentators have contrasted it with dedicated screen recorders like Fraps. Personally, though, I saw no difference between Fraps and the WeGame client — both kill my system performance (and, admittedly, my computer is a POS compared to what most gamers would consider a real machine).
On the other hand, the WeGame client is free, which is hard to beat — though still Windows only.