XNA Team Blog
http://blogs.msdn.com/xna/default.aspx

Shawn Hargreaves Blog
http://blogs.msdn.com/shawnhar/default.aspx

XNA Japan Team Blog
http://blogs.msdn.com/xnajapan/default.aspx

ひにけにXNA
http://blogs.msdn.com/ito/default.aspx

Ziggyware XNA News and Tutorials
http://www.ziggyware.com/news.php