It's available for Mac, Windows, and Linux; if you're on Debian unstable the installation is as simple as
apt-get install democracyplayer (I uploaded the new packages yesterday, they should have reached all mirrors by now).
If you want to know what this is all about, but you're reluctant to install yet another program, check out this screencast (MOV, 37MB) which shows the basic functionality and user interface and discusses some of the new features... I think you'll like it.
You can use it for all kinds of video blogs and podcasts, it'll download and play almost anything with an RSS feed.
No. Time. To. Blog. But these few lines I wanted to post nevertheless: there's some neat new packages in Debian since today: Nexuiz (nice ego shooter), rcov (code coverage for Ruby), and Democracy Player (RSS video downloader/viewer for videoblogs, packaged by yours truly, as promised).
As mentioned earlier, I wanted to package the KDE videoblog client kitty for Debian. I finally found the time to really do it, and the package has entered Debian unstable a few days ago. The first bug has already been reported (sigh), but I'm working on it.
kitty got even mentioned in Debian Weekly News (w00t!)
The editors of the New Oxford American Dictionary have chosen 'podcast' as the word of the year.
I bet next year they'll choose 'vlog'. We'll see.
A Debian package should be available in a few days, I already have a test-version running on my local box...