Let me just say that CamStudio is a fantastic application for screen capture videos. A friend told me about this a few days ago and I am just floored by efficient and intuitive this application is. And, best of all, IT'S FREE.
I have been a fan of SnagIt for a while for all my simple image editing needs, including video screen capture. I can say that I will likely never again use that feature in SnagIt. CamStudio will suit my future needs in that department.
CamStudio captures to the AVI format and has a built in SWF producer to convert the AVI's to Streaming Flash. CamStudio can be downloaded via SourceForge.net