Here's an eBay listing which shows Zipp rims built front 16h (radial spoking) and rear 24h rim, 32h hub, 16 drive and 8 non-drive spokes (triplet spoking). Weight is under 1100g for the pair. Looks pretty nice!
Rims: Zipp 280 carbon fiber rims, approximately 280 grams each, 38mm deep (for good aerodynamics). The front has 16 holes, the rear 24.
Front is the American Classic Micro hub ... with thick flanges to support the low spoke count.
Rear is the American Classic Ultralite Cassette ... 32-hole hub that has been laced with 16 spokes on the cassette side and 8 on the other side. This arrangement helps equalize the tension between the left and right side spokes, reducing the likelihood of spokes going slack and the wheel going out of true.
Spokes: 16 Alpina stainless steel aero (oval) spokes on the front wheel, laced in a one-cross pattern. 24 Hoshi stainless steel bladed spokes on the rear, 8 in a one-cross pattern on the left, 16 in a two-cross lacing on the right. This makes for a durable, low-maintenance wheel. Neither the Alpina nor the Hoshi spokes require the hubs to be slotted to accommodate them (a procedure that weakens the hub).
The wheels were built using the methods described in the standard text, 'The Bicycle Wheel' by Jobst Brandt, the spokes taken to uniform high tension and stress-relieved for durability.
And for further explanation from Dave's Wheels website:http://www.speeddream.com/road.php
Rear wheels are 24-spoke triplet style - 16-drive side spokes, 2 crosses, and 8 non-drive side 1 cross pattern. The two to one distribution of rear spokes provides for greater drive torque and enhanced the overall strength and stiffness. This is the same spoking arrangement that I got started with in 1987; of course I copied it from "Hi E" wheels in 1979... The more things change the more they stay the same!