The Library of Congress is archiving legal blogs. Check out the online archive. It is an ongoing archive of legal blawgs for the period of March 1, 2007 to present.

The Legal Blawgs Web Archive is a selective collection of authoritative sites (associated with American Bar Association approved law schools, research institutes, think tanks, and other expertise-based organizations) that contain unique, born digital content. These blogs contain journal-style entries, articles and essays, discussions, and comments on emerging legal issues, national and international. Additional sites are selected incrementally.