Kevin O'Keefe of Lex Blog has but together his latest status report on big law firms that blog: State of the AmLaw 200 blogosphere, March 2008. Kevin includes a list of the firms and list of the blogs.
Since August of 2007 the number of AmLaw 200 firms with blogs has increased from 39 to 53. Since many of the firms have multiple blogs, the number of blogs has increased from74 to 110. That is great growth