The article discusses the past, present and future of law blogs. By his calculation there have been over 1,500 law blogs created since 2002 and that 80% of these are still active. That would put the number at roughly 1,200 law blogs (1,200 - 643 = 557).
The article provides some practical advice for lawyers who might be just jumping into the blogoshere and allows those of us who have been blogging for a while to better understand why we do it and how we can improve what we are doing. I've been toying with the idea of a collaborative health care blog idea and was excited to see that Tom predicts collaborative blogs will be on the rise in the future.