Great thread and excellent links to useful articles.
We have a DIY NLE computer article on our website. We just updated it last month.
http://www.videoguys.com/DIY.html
PC World magazine posted a nice article on building your own machine
http://www.pcworld.com/howto/article...,116993,00.asp
VideoSystems magazine did a nice article on building a machine for HDV editing
http://videosystems.com/mag/video_homebuilding_hdv/
Gary