Below is a list of blogs that discuss Scrum and Agile. There are many more. Add your favorites. Thanks! And enjoy.
Scrum Log by Jeff Sutherland
http://implementingscrum.com by Mike Vizdos
Agile & Business by Joe Little
http://www.notesfromatooluser.com/ by Mark Levison
http://silkandspinach.net/ by Kevin Rutherford
http://www.agileadvice.com/ by Mishkin Berteig and many Guest Authors
http://www.trailridgeconsulting.com/ by Pete Behrens
http://undefined.com/ia/ by John Brothers
http://on-agile.blogspot.com by Ryan Cooper
http://chrissterling.gettingagile.com/ by Chris Sterling
http://blog.gdinwiddie.com/ by George Dinwiddie
http://www.estherderby.com by Esther Derby
http://xndev.blogspot.com/ by Matt Heusser
http://www.jamesshore.com/Blog/ by James Shore
http://lauploix.blogspot.com/ by Laurent Ploix
http://www.futureworksconsulting.com/blog/ by Diana Larsen
http://xprogramming.com/xpmag/index.htm by Ron Jeffries (not quite sure if it qualifies as a blog; on the bubble for that...but very useful in any case)
http://blog.lundak.org by Jiri Lundak
Succeeding With Agile by Mike Cohn
http://blog.crisp.se/henrikkniberg/ by Henrik Kniberg
all about agile | by kelly.waters
Net Objectives Thoughts Blogs and Podcasts on Lean-Agile by Net Objectives
http://ericlefevre.net/ by Eric Lefevre
Adventures in Agile Software Development and Scrum by Kane Mar
3Back Thoughts - The 3Back Team
Scrum Breakfast - Discussions around Scrum, by Peter Stevens
The Agile News - Community filtered agile news.
The Atlantic Dominion Solutions blog - by Robert Dempsey
Agile Voices is an aggregator of agile related blogs
http://agileworld.blogspot.com by Venkatesh Krishnamurthy
www.agilebob.com by Bob Hartman (Agile Bob)
http://agilefun.com by Jürgen De Smet
http://danielbrolund.wordpress.com by Daniel Brolund
http://agileanarchy.wordpress.com/ by Tobias Mayer