The characters in Ecodigm update theirs via newsposts on our guilduniverese website. I've only seen one other person who has such a blog, sadly.
I would have thought that there would be more people who thought of this idea. I'm considering it myself, and will post the link when I get it started.
I have somehing like that on the link below. Mines something of news reports of big crimes that Ryan the Shadow does and the such 
Okay, I got mine up and running at the following link
http://360.yahoo.com/solarstormcom
I know some other folks are using blogs for their CoH characters. Anyone care to share?
My magic defender has one at:
http://www.livejournal.com/users/lyndacrighton/
-B