Shawn Hargreaves Blog
I just noticed that Bob Taco (of creators.xna.com forum fame) has a blog with some great XNA related content…
My XNA Game Development blog ...
another one, in spanish:
Let's not forget all the fun going on @ XNA-UK.NET
Home of RandomChaos and DarkGenesis
My 2D fighting engine currently in development: kokusaifightingengine.blogspot.com