Wes,

I saw the following listed product at the 2007 International Builders' Show in Orlando:

BattenUP Battens by Battens Plus, Inc. 530-620-5287, www.BattensPlus.com This company sells a plastic looking batten for Class A tile roofs. This batten replaces wood battens. It will resist ponding since it has large fluted channels in it. It won’t absorb and hold moisture as wood does. It allows air circulation to dry the water that reaches under the tile, keeping the roof surface cool.

Looks like a good product. I would like to see more tile and concrete roof tiles here (Minnesota) but asphalt shingles are at least 90% of the market.