@adCar - I use camstudio to record, get it to record only the top left 800x600 and just move over the workspace to there. Then just save it and speed it up to some somewhere that fits between 4-8 minutes in windows movie maker 2.6 and add some music.

@Ion - Yea, but i'm terribad at rendering, so what i do is use the polygonal marquee tool and do a rough render, save the selection and use it to delete the clipping mask parts.