Velonew recently did a tech review of the Egg Beater peddles by Crank Brothers. Simple design. I don't have access at the moment to my VeloNews which is at home, but I think the price was listed as $120. 282 grams.

http://www.crankbros.com/ThePedal.htm

Bicycling review:
http://www.bicycling.com/daily/gear/report0019.shtml