It's the latest trendy thing to have on your web site. It's NetTalk for "Web Logs", and all it is really is a journal.
With all the reality TV going on, people want to read about people real life now. So, the trendy thing is to keep an online journal and talk about your everyday life for everybody to read. Used to be "Guestbooks", now you gotta have a Blog if you want to be hip.

Tech TV covered the topic a few times:
http://www.techtv.com/callforhelp/features/story/0,24330,3339097,00.html
http://www.techtv.com/screensavers/supergeek/story/0,24330,3302121,00.html
http://www.techtv.com/products/software/story/0,23008,3346341,00.html