By now all the newspapers and such have reported about it, but I would still prefer to refer you to the Scientific American article here. It reports the results of research that indicating that blogging is good for you, as in - people who blogged had a higher chance of overcoming cancer, to name but one example.
Not that I think the research is that accurate. For a start, it claims blogging improves your sleep, which definitely doesn't apply in my case as most of my blogging is done when I should actually be asleep. That said, it does discuss the addictive nature of blogging, and I certainly am. It reminded me of an interview with Don Henley (of The Eagles) we listened to last night on the car radio, where he said that writing the first verse of Hotel California was better than sex. I don't know about that, but writing is a pleasure none the less.
Read it and blog.