Jump over and read through the list…there are some great blogs there including some of my favorites:
Raven’s Brain – Raven does a great job covering many aspects of PM.
Bruce’s Brain – Great blog from one of the leaders at LiquidPlanner.
PM Hut – A great resource for PM information.
Project Shrink – A great blog focusing on the people in projects.
David listed many more…jump over there and check them out.