Recently I found an issue when I went to edit a video tutorial on Photoshop in Blender's VSE that I had created with CamStudio 2.6. The problem arose when I rendered the video after editing in Blender VSE. The resulting video was sped up. I am not sure why it happens but I was able to find a solution or work-around.
The conclusion and work-around is to use Camtasia to record Photoshop tutorials so to show the tools accurately. Unfortunately Camtasia is not a free alternative to CamStudio, but for the moment it is the only solution for recording Photoshop. If Photoshop ran on Linux we might have other alternatives, but that is a whole other topic. An added benefit with Camtasia is that it is designed for producing professional video tutorials with a slew of added tools for editing video and adding content and it does a great job of creating small yet high quality video files. The free alternative to record the use of other applications I recommend is the combination of CamStudio, Virtual Dub Mod and Blender VSE (Video Sequence Editor). I have been able to accomplish 99% of all my tutorials with these applications.
Hope this helps,