-spam fighter, *nix user
http://www.planetmike.com/

-reporting services tweaks
http://blogs.msdn.com/chrishays/default.aspx
and tutorials

Not blogs, but still good reference:

-VBscript including AD and Exchange
http://www.computerperformance.co.uk/Logon/Logon_CSVDE.htm

-Everything related to windows server
http://www.petri.co.il/planning-sites-services-architecture-windows-ad-exchange-2007-server.htm

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