It seems like more and more literary agents have blogs these days. Agents may use their blogs to promote their clients work, mentor aspiring writers or as a way to distribute updates about the everchanging publishing business. Whatever reason the agent uses their blog, it is a great tool to learn more about the agent and to determine if they would be a good fit for your work.
Here are some of the agent blogs:
http://www.jetreidliterary.blogspot.com/: Janet Reid's blog, it's an excellent mix of publishing info, submission do's and don'ts and client promotion. And just the right amount of snark.
http://blog.nathanbransford.com/: Nathan Bransford's blog: includes some great advice for new writers and publishing info. He includes some tips for writing query letters that are incredibly useful.
http://www.pubrants.blogspot.com/ : Kristin Nelson's blog. Her blog includes sample pitches from some of her actual clients. She also describes why the query worked.
http://www.queryshark.blogspot.com/: Janet Reid also manages this blog. Step into the shark tank if you dare to have your query critiqued.
http://cba-ramblings.blogspot.com/ Rachelle Gardner's Literary Ramblings blog includes tips on writing query letters, how to write a book proposal and also includes questions to ask literary agents when you get "the call." There's some great information on her blog.
http://www.bookendslitagency.blogspot.com/ The blog kept by Jessica Faust of the Bookends Literary agency. She frequently answers comments and questions on her blog and is a great mentor to aspiring writers.
Other Lit. Agency blogs:
http://theswivet.blogspot.com/ Colleen Lindsey's blog, she's with Fineprint Literary Agency
http://dglm.blogspot.com/ Dystel & Goderich Literary Management blog
http://litsoup.blogspot.com/ Jenny Rappaport Literary Agency blog
http://arcaedia.livejournal.com/ Jennifer Jackson's blog of the Donald Maas Literary Agency
Some agencies include blogs on their websites. These include:
http://www.greenhouseliterary.com/ Sarah Davies of Greenhouse Literary Agency
http://www.upstartcrowliterary.com/ Michael Stearns and crew at Upstart Crow Literary Agency
I know there are some great blogs that I missed. Frequenting agency blogs is a great way to learn what's going on in the publishing business not to mention a great way to determine which agents represent the type of manuscript you want to submit.