Peter White Wheel Pages:
http://www.peterwhitecycles.com/wheels.aspHe uses Brass nipples and Wheelsmith's spokes. He uses to use DT (For the above article for details). Peter White goes into details on how he makes wheels. As to Aluminum nipples, Peter White Writes:
"If you want aluminum nipples, I will now build with them. However, my lifetime warranty does not apply to nipple failure of any sort. If your aluminum nipples crack or round off after you've been using the wheel and they need truing, the cost of replacing them will not be under warranty. I only warranty brass nipples!"
Peter White also has 27 inch rims (i.e. NOT 700cc but "true" 27 inch rims for older bikes).
Another source about information on Wheels:
http://sheldonbrown.com/harris/wheels.html