In the book Professional Community Server I covered how to set up your community server installation for blogging at the root. Since this book was based on community server 2.1 it didn't cover how to set this up in CS 2007. Check out this forum post
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Read the complete post at http://jamesdmartin.com/archive/2007/04/24/blogging-at-the-root-in-cs-2007.aspx