Aaron has a post on his blog that describes way of silent install of VCRedist.EXE. I though I would cross-link it from my blog in case some folks are interested in this information. Here is the link http://blogs.msdn.com/astebner/archive/2007/02/07/update-regarding-silent-install-of-the-vc-8-0-runtime-vcredist-packages.aspx

Edit: I have updated the link to a newer post on Aaron's blog with more information.