I want to point out that last year I set up a web2.0 site just for the 30DC. We had some trouble with hackers and sploggers when we went public with it and had to shut down for a while.
But now its back and available to 30DC members
Here's the site:
Rticlz.com
Its got a PR3 and does very well with Alexa. I got a blog to #2 in Google in about 2 hours with it, so I know its still looked at by the search engines often.
So help yourself to a blog or two, but please make sure when you set one up that you have content ready to go into it. I still have some splogger paranoia and may delete blogs that are empty for a period of time.
If you need any help with it, or would like a specific theme or plugin added, just let me know