Just came across this on ebay- a mr16 housing with 3 X 3W led emitters inside:

http://cgi.ebay.com/MR16-LED-bulb-L-...QQcmdZViewItem

Seems like an interesting option for those folks who don't want to fabricate their own housing. Should fit into a stardard driving light or other mr16 enclosure.

Anyone know what kind of driver setup, if any, would be required for this light?