One "top" list that gave me new information (the best kind of list...) was "The Best PR Blogs Out There" by Jeremy Porter on the Journalistics blog. Here are some of Porter's favorite blogs he recommends reading regularly:
In the post, Porter also expands into "Other PR blogs worth a look," "Non-PR blogs PR pros should read," and "PR blogs I need to explore further."
In addition to reading the article, I also highly recommend reading the comments - many PR pros comment in about other useful sites to explore!
Happy New Year's Eve!