There is probably much inspiration to be drawn from the Lawrence Hall of Science GEMS (Great Explorations in Math and Science) unit, Environmental Detectives. This has some nice relatively-low-budget real-world laboratory experiments which could go along with the unit.
Homunq 10:40, 7 April 2008 (EDT)
Lin, this proposal looks great. I like the section you added on inspiration -- I'm looking forward to seeing how this turns out! --pdubroy 19:56, 8 April 2008 (EDT)