Looks like the Library of Congress has started blogging. Blogger and new LC Director of Communications, Matt Raymond explains:
Because the vast majority of visitors to the Library of Congress do so only virtually (via this Web site), I wanted to give readers the opportunity to see more of the institution, to give them the online version of a docent who can highlight many of the wonderful things that happen here.
There is a RSS feed for the blog, of course. LC also has a number of other feeds.