ScI-Journal http://www.sci-journal.org/index.php
Online journal of high school and college students' lab reports from their science classes, labs and fairs. A discussion list allows messages about each report to be posted on the site.
Solar Now Project http://www.solarnow.org/
Includes an experiment entitled "What Stores Energy Best?" and an activity entitled "Make A Pizza Box Solar Oven". From the U.S. Department of Energy's website.