Tim,
below are some very valuable resouces,
http://www.robertsondne.com/
http://www.ultracad.com/articles.htm
http://www.merix.com/resourcecntr/res_intro.html
UltraCad as well as Chris Robertson's site have impedance Calculators.
Merix has a great DFM manual..
Enjoy....
Sam Cox
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