We know that YouTube videos are copyrighted by YouTube, and their TOS clearly states that their videos cannot be copied without permission.
We couldn't help with that as it contravenes Forum Policy. If those other sites you mention have similar copyright restrictions you will fall onto the same Forum Policy violations.
I'm looking for software to download live streaming video, such as on ustream, livestream, justin.tv, etc., and I'm having a really difficult time finding one that:
2.) is free (perhaps that's my probelm?)
3.) and also downloads regular videos like those on Youtube.
I tried Orbit Downloader, but it doesn't work with the new Firefox (3.6).