For a long time I was using Camtasia Studio for screen capture and recording online presentations. I always liked this software becasue it doesn't interfere with the other applications on the dev server that is usually heavily loaded with lots of different software solutions and services and it doesn't slow down the server as well. It provides a very strong sound and movie editing studio but you need to pay 299 USD for the license.

 My new choice is CamStudio. It doesn't give you a fancy movie editing studio, but it happily works on Windows 2003 server loaded with MOSS 2007 and BizTalk 2006. It doesn't slow down any process and it is FREEEEEE!!! Ok, for the editing studio go for Microsoft Movie Maker and you are all set.

Cheers
Alireza