Capture Fox Movie is a Firefox add-on and a handy tool to create tutorials about a software, a web site or anything that can be displayed on your computer. It records your screen frame by frame. You can also record your voice.
Taksi is a utility that allows you to take screenshots and record video clips of your favourite games and other 3D-graphics applications. Inspired by Fraps (www.fraps.com), Taksi aims to provide an open source alternative to that great tool.
Taksi can support live video compression with any VFW video codec your system has installed (i.e. XVid, DivX, MS Mpeg4, etc).
Geelix HUD provides in-game features such as chat, desktop sharing, high definition video recording, and in-game video browsing.
The Gellix site allows players to share gameplay captures. This link goes to the SL section.