How do I create a screencast?

[Damien Hull]

Here's what I've got.
1. Ubuntu Hardy Heron
2. Compiz Fusion
3. Intel(R) Celeron(R) CPU 2.53GHz
4. 1G RAM

I've been trying to create a screencast with "Gtk RecordMyDesktop". It works okay. The problem is the 3D desktop. When I rote the cube frames get dropped. That ends up as flickering in the screencast video. 

I've seen several YouTube screencasts without any flicker. How are people creating flicker free screencasts?