downloading videos
To reduce storage space on my website I don't offer downloadable video files. But you can download my videos from YouTube with a YouTube downloader (like this, this, this, this, or others) or use a free web converter like this.
I use this two-step conversion:
1. Enter YouTube URL at keepvid.com to convert to FLV.
2. Convert the FLV to AVI (or view the FLV in a free FLV player).
Update: YouTube is now offering one-click downloadable FLV's for some videos, so all you need after downloading the FLV is the FLV to AVI converter or the FLV player.