There are a few YouTube videos that I’d like to keep permanently, one of them being Gir2007’s Barbados Rocks. A quick bit of net-scouring led me to KeepVid.com, which will let me save the source FLV file (Macromedia Flash). A bit more scouring leads me to 409’s page on converting with ffmpeg, and presto, I have a 13 MB file that I can watch whenever I want, without firing up a browser or needing an internet connection.