Since starting my own Weblog I've been asked by several friends and co-workers “What is a weblog?“.  To help answer that question, and several others I've been asked, I came across a great new article on MSDN by Aaron Skonnard.   It should answer most of the technical questions around Blogs and RSS.  The “Why?“ question you'll have to figure out for yourself...

http://msdn.microsoft.com/msdnmag/issues/04/04/XMLFiles/