I am sure that I am missing a few, but this is certainly a good starting point.

·         Addicted to Digital Media

·         Barak's Blog about Silverlight and beyond

·         Building a Better User Experience

·         Come Get Some...Thoughts On Software Technology

·         Delay's Blog

·         DevDave - Dave Relyea's Blog

·         Eric Griffin's Blog

·         Even a chimp can write code

·         ExplosiveDog.Com

·         Gavin Gear's Tech Blog

·         Jaime Rodriguez

·         Jeff Prosise's Blog

·         Jesse Liberty - Silverlight Geek

·         Joe Stegman's WebBlog

·         Laurence Moroney's Web.NEXT Blog

·         Michael's Blog

·         Mike Harsh's Blog

·         Mike Taulty's Blog

·         MS MossyBlog

·         Nick on Silverlight and WPF

·         ScottGu's Blog

·         Silver Lighting - My Silverlight Blog

·         Silverlight SDK

·         Somasegar's WebLog

·         Tim Sneath

·         WynApse