These are a few resources I have used and recommend.

Activities to do in a cemetery
http://www.angelfire.com/ky2/cemetery/
http://www.earthballoon.com/edsource.htm

After school resources
http://www.ed.gov/pubs/After_School_Programs
http://www.ed.gov/pubs/SafeandSmart?
http://www.afterschool.gov/
http://www.dpi.state.nc.us/service_learn/1.html
http://www.jmgkids.org

Examples of service learning projects
http://www.macomb.k12.mi.us/wq/meb2cl.htm

Gardening with Children:
http://www.kidsgardening.com/
http://www.geocities.com/enchantedforest/glade/3313
to http://www.copper-tree.ca/garden/

Look Out Below!
http://foresty.about.com
http://www.dfr.state.nc.us/

Moss
http://www.ncsu.edu/sci-link/studysite
http://www.ncsu.edu/scilink
http://www.usgs.gov/education

Big Sweep
http://www.ncbigsweep.org

Environmental Certification
(This is a great endeavor that can give you a tour of some N.C. State Parks. These make great fieldtrips too! I strongly recommend this certification.)
http://www.ee.enr.state.nc.us/Certification/ee_certification.htm

Project Wet
( A wonderful environmental class that involves a great book Full of great activities dealing with water!)
http://www.projectwet.org/

Project Learning Tree
( Another great workshop that includes a great resource book and counts toward environmental education certification.)
http://www.plt.org

Recycling Extravaganza
http://www.earth911.org/master.asp?s=pop&a=1
http://oncampus.richmond.edu/academics/a&s/education/projects/
webquests/paper/

Resources Index
http://www.projectwild.org/
http://www.plt.org
http://www.globe.gov
http://www.ee.enr.state.nc.us/Envir_Data/Inquiry-Based%20learning.htm
http://yucky.kids.discovery.com/
http://www.wormdigest.org
http://www.fiu.edu/~time4chg/Library/bigdummy.html
http://www.servicelearning.org
http://learnandserve.org
http://www.fiu.edu/~time4chg/Library/ideas.html
http://www.ncpublicschools.org/service_learn/
http://www.populationconnection.org/

Service Learning
http://www.dpi.state.nc.us/service_learn/1.html

Stream Watch
http://www.ee.enr.state.nc.us/guide/streamwatch.htm

Teaching with Terrariums
http://caca.essortment.com/buildingterrari_rwoo.htm
http://muextension.missouri.edu/xplor/agguides/hort/g06520.htm
http://www.onekama.k12.mi.us/bjbrown/former/bjbrown/4th01-02/terrarium/terrariu.htm

40 Assets
http://www.search-institute.org/assets/forty.htm

Population study
http://www.puzzlemaker.com

Clipart
http://www.clipartconnection.com
http://www.bellsnwhistles.com
http://www.4teachers.org
http://school.discovery.com