It's been too long since I spotlighted great agent blogs around the Web.
That said, let me sing the praises of the BookEnds, LLC Blog. BookEnds is a literary agency based in New Jersey and is part of the AAR. The agency's three agents are Jessica Faust, Jacky Sach and Kim Lionetti. (To learn more about all three, check out their "About Us" page.)
The most recent post I read was this post on why exactly agents request exclusive reads. The blog is worth a long look, so give it just that!