Mac OS X only: Fresh from the Google Mac workshop, new video application Vidnik records clips with your Mac’s camera and uploads them directly to YouTube.
You can use Vidnik to create a video diary, or just to quickly record a video comment to attach to an existing YouTube video. Vidnik works with the built-in video cameras on recent Macs, with FireWire video cameras, and with many USB video cameras.
You can also drag and drop existing video clips on your Mac into the left column in Vidnik to use it purely as an uploader. Vidnik is a free download for Mac only.