I am not up on the latest standards, so tell me if this is possible today.
A big problem I have with both both Podcasts and VideoCasts is, as someone mentioned, you need to give your full attention.
If I had a long train/metro commute every day, I would load up and it might be worth the effort.
But one drawback I have had with many podcasts and videos is that the content creators package a whole "show" or episode. I would like a very clear "table of contents" and the ability to quickly jump to the next story (track or bookmark) in the episode. It seems most podcasts give you a description, but then you have to fast forward to find the bits you want. I think Audible content has bookmarks, but not sure how that works.
So I would want much more granular pieces ("nuggets"), each with a good description and meta data, and an RSS aggregator (or MC) that pulls them in based on keywords, other users ratings, social networking relationships (i..e my friends are watching something), rather than the bundles of content in many current podcasts. Basically to pull in GoogleTube video clips regardless of source, rather than me subscribing to a given source for every one of their episodes.
I think some of that is here today and some is coming soon.
I would be curious of those watching video casts as to what device you are watching on: PC, main television or iPod.
Just some thoughts.
EDIT:
For example, i went to Revison3 to see Kevin Rose et al, and one episode has this:
REVIEWS: "Science of Sleep" "Heroes" "Studio60"; TRAILERS: "300"; NEWS: Reitman's Juno, Altman Hard Body, Wargames2:the dead game, Die Hard 4 Villain? new Myazaki film; COMICS: Ed Brubaker's "Criminal"; VIDEO GAMES: Sonic on 360, Fear, Fuzion Frenzy 2; FORUM: Has a movie or tv show ever motivated you to do anything?
Out of all of that, I wanted to first see their review of Studio60 (I happen to like it and wanted to see what they think). The file is 360mb. So I stopped.