Here are some links I find useful for improving education (and some that are just fun)
Understanding Science – from UC Berkeley. lots of general science stuff. http://undsci.berkeley.edu/index.php
Bioliteracy project. Lots about misconceptions and similar issues. http://bioliteracy.net/
Catalog and discussion of ecological misconceptions. http://ecomisconceptions.binghamton.edu/index.htm
School Yard Ecology Project (As far as I can tell, only chapters 1 and 3, + the very helpful appendices are online, but this is loaded with good ideas):http://www.ecostudies.org/syefest/contents.htm
Ecological Society of America (ESA) Education Resources Page (good guide to ESA’s offerings): http://esa.sdsc.edu/ed_resources.htm
Teaching Issues and Experiments in Ecology (ESA – TIEE Web). Student-Active Teaching and
Learning Resources (new project from ESA — lots of good ideas, and will grow substantially in the near future): http://www.science.widener.edu/~grant/esa/tiee/teach/teach.html
ABLE – Association for Biology Laboratory Education: http://www.zoo.utoronto.ca/able/
Resources for Scientists Teaching Science: http://instruct1.cit.cornell.edu/courses/taresources/
Study Guides and Strategies (good site to provide for students to learn about studying and learning — also good for teachers): http://www.iss.stthomas.edu/studyguides/
FIRST – Faculty Institutes for Reforming Science Teaching Through Field Stations (emphasis on inquiry and field work): http://darkwing.uoregon.edu/~first/
Merlot (hundreds of multimedia resources – mostly but not all for college level): http://biology.merlot.org:9100/Home.po
Science Teaching Reconsidered – a helpful online book from the National Academy of Science about improving our teaching
http://books.nap.edu/html/str/
Access Excellence (Biology teaching resources) http://www.accessexcellence.org/
NSF’s ‘FIRST’ program (see http://darkwing.uoregon.edu/~jhodder/inquiry.htm and links from there) is aimed at using field experiences and field stations to engage students in science
SUNY buffalo has a fantastic collection of case studies at http://ublib.buffalo.edu/libraries/projects/cases/case.html
UA has some great sources too: http://www.uakron.edu/biology/
Intro Ecology @ Villanova: http://oikos.villanova.edu/courses/~3255/labs/index.html
Pollination labs: http://www.life.umd.edu/Faculty/inouye/Pollination%20Exercises/
Woodlice online: http://www.geocities.com/CapeCanaveral/Hangar/7649/wlice.htm