Good site for a beginning instructor. Collaborative Learning Page Useful introduction to the techniques, resources, and practicalities of small learning groups. In-class Activities at Michigan State University Beth Hufnagel and Bob Stein have created a series of interesting collaborative group activities for large lecture classes and have very kindly put them on the web. Some require images not yet on the site, but most can be seen and used in their entirety. A multiple choice exam that tests student preconceptions about basic astronomy.
Site provides a national database of scores.
I list this site last, and reluctantly, because, unlike all the others, it requires participation and a password for you to get information. ConcepTests are multiple-choice astronomy questions designed to get small group discussion and peer instruction going in large classes. Physics Demonstrations on Line Keith Warren at North Carolina State has collected a large number of links to sites that feature demonstrations for physics classes, including some astronomy ones. Active Astronomy Tim Slater has put a curriculum of 21 hands-on activities on the web, many of which take interesting or fresh approaches. Alas, some are missing crucial elements, like charts or images, in the web version.