Here's the only one I know of from ftlum:
http://www.greenhybrid.com/share/fil...8/HCH-2006.jpg
There have been a few others - HCH I's though. I replaced mine back in Nov for my 03. I went with lighter rims (dropped 2.3 lbs per wheel) but went with spoked. I think there
is something to the wind resistance of the wheels. I'd be hard-pressed to show you data, however at face-value the disk wheels should provide lower drag than spokes. However, I have not noticed any degrade with my wheels - no benefit either. And I do like the look better.