Justia has up and running a "Blawg Search" site which you can find here.
There are 844 Blawgs in 45 categories according to the site, with more being added each day. Eyeing the catergoies it looks like Intellectual Property Law has the most blogs within it(80), with Law Professors (71) and Tech (59) 2nd and 3rd. Blawg.org lists nearly 1500.
To pick a nit, it looks like there is are separate categories for "Carolina" and "South" which probably means South Carolina, which probably means Dave Swanner's site. Alas, his site is not in the section titled "Injury and Accident Law" where it should be. Let's see how long it takes to fix that.