SLJ's online journal has several blogs. The one most applicable to Readers' Advisory is Teen Librarian Toolbox. On the off chance you can access it because of ALA membership, you can find Karen Jensen at @TLT16. She is also on Facebook.
Epic Reads Blog -Young Adult books from A to Z. Including videos, new releases, interviews, top lists and much more! About Blog Epic Reads, brought to you by HarperCollins Publishers, is the largest online community of fans of young adult books! We are a passionate, vibrant community of Book Nerds from around the world who love talking about, sharing and discovering new books. Join the EPICREADS.com community to find the hottest teen books, connect with your favorite YA authors and meet new friends who share your reading interests.
Booklist Reader Blog - Opinion, news, and lists from the book people at Booklist, Book Links, and Booklist Online
The Blog @ Junior Library Guild - Inspiration for Readers and Library Leaders.
YA Book Central - About Blog YABC is your first stop for all things book-related! Founded in 1998 by (now author) Kimberly Pauley as a basic stopover for people looking for information on young adult books, YABC has since evolved into one of the largest professional book recommendation sites targeted towards tween and teen readers.
Many of these resources and programs are funded under the provisions of the Library Services and Technology Act from the Institute of Museum and Library Services.