Savevid.com lets you download videos from streaming video sites. You can download videos from Youtube, Google Videos, Metacafe, Spike and more in FLV, AVI, MOV, MPG or WMV formats.
TubeMogul is a free service that provides a single point for deploying uploads to the top video sharing sites, and analytics on who, what, and how videos are being viewed.
TubeTV is a freeware program for Mac OS X which enables you to search for, save, and convert YouTube and other flash videos to a format suitable for playback on your favorite devices.