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What blog community site do you recommend for a new .NET blogger?

I have a very knowledgeable friend who would like to start a blog about topics such as Windows Vista and VS 2005. He asked me where he should open his blog. I didn't have a good answer.
So, what blog community site would you recommend he start with? It has to be free and well maintained.

Still alive, in Ireland.

.Math - Open Source math expression compiler in C#