Just write them down...

Diggnation & Tekzilla! in Xvid small format, using mplayer.

it takes awhile to download but worth the wait...

http://revision3.com/

they also offer the shows via a flash stream like youtube.

-matt

I prefer Tekzilla in mp4 format. It has a weird grey bar on the bottom, but it fills the screen.

Others I added to the Video Center:

Nova PBS Vodcast
dl.tv
Cranky Geeks
MobuzzTv (PSP version fills the screen)
PodshowTV
Rocketboom (PSP version)
TikiBar TV (episodes after 16 are OS2008 compatible)
Anderson Cooper 360

I'd like to share my enthusiasm about the video content of the following two sites. Slightly OT since the first is only OS2008 compatible through re-encoding, since the iPod version doesn't play smoothly (have notified the site manager to provide more video formats). I haven't checked whether second can be used from its feed, but the content is great.

- Check the TED talks on www.ted.com for some really inspiring food for thought on a diverse set of topics (5-20mins long). Speakers include physicists, biologists, designers, architects, photographers, game designers, economists, authors, musicians etc.

- Also, for the photographers among you - check the Radiant Vista website for twice-weekly photo critiques and Photoshop tutorials. The tone of the talks is very friendly and Craig Tanner, who critiques the photos, projects a very warm & supportive athmosphere. The WMV versions of the files can be watched via MPlayer without re-encoding http://www.radiantvista.com/critique

Enjoy.