Well, I can't think of any blog/news feed more relevant than Library Journal News or the Blogging Libraries Wiki. But that doesn't stop me from looking at Folger Shakespeare Library or Smithsonian. So many blogs, so little time!
Merlin has probably been the easiest experience with finding feeds since I just used the subscribe button. And I'm familiar with Merlin because I've been a member for 43 weeks and 6 days! (I did a couple online Microsoft courses at this site.)