"AOL's video player window doesn't allow you to save movies to disk, and most other methods of downloading movies won't work, so here's a method I found that works.
First, 'view source' in the video player window. Near the bottom of the source window, you'll see a line like:
Copy the entire URL from that line (which may be split into more than one line. Next, open a terminal window and type: curl ' (note a single quote here). Paste in the URL you copied and type '> and a filename you wish to save it in. The quicktime movie file will be downloaded and will be playable as a self-contained movie."
Quelle: MacMegasite (Tip: Saving Live 8 videos from AOL | MacMegasite)