Solar Cookers, not ovens

http://www.outdoorcook.com/article1051.php
Modified Funnel Cooker

http://ecobites.com/component/content/815?task=view
Unique Parabola Cooker

http://www.sunspot.org.uk/Solar1000/solar1000.htm
using Satelite dish for a cooker, and wonderful explanations of how it works

http://mysite.verizon.net/vzeeka5a/earthboundtek/index.html
Plans for making your own parabola/parvati style cookers

http://solarcooking.org/plans/
This has numerous plans for Funnel and Prabola style cookers.