Here are some links to local groups and resources, and national links to co-ops and other relveant resources.
Local Friends and Partners
http://www.cheltenhamadultschool.org
Cheltenham Art Center
http://www.cheltenhamarts.org/
Cheltenham School District
http://www.cheltenham.org/sdct/site/default.asp
Cheltenham Township (Municipal Government)
http://www.cheltenhamtownship.org/
Cheltenham Township Historical Commission
http://www.cheltenhamtownship.org/histcomm/index.htm
Eastern Montgomery County Chamber of Commerce
http://www.emccc.org/
Elkins Park Hazon CSA at Kol Ami
http://www.ElkinsParkHazonCSA.com
Friends of High School Park
http://www.fhsp.org/
Greater Glenside Chamber of Commerce
http://www.glensidechamber.org/
Old York Road Historical Society
http://www.oyrhs.org/
Pennsylvania Association for Sustainable Agriculture
http://www.pasafarming.org
Here is a list of several co-op directory sites that should help you find whatever co-op you're looking for:
Blooming Prairie Foundation (www.bloomingprairie.org)
Co-op America http://www.coopamerica.org/
Co-op Directory www.coopdirectory.org
Co-op Domain Registration:http://www.cooperative.org/
Co-op Power www.cooppower.coop/
Cooperative Development Services (CoCoFist) (www.cdsfood.coop)
Cooperative Grocers Information Network (www.cgin.coop)
Cooperative Grocer Magazine (www.cooperativegrocer.coop)
The Energy Co-op www.theenergy.coop/renewable_elec.htm
Equal Exchange (www.equalexchange.com)
European Community of Consumer Cooperatives www.eurocoop.org
Fair Trade - Transfair USA (www.transfairusa.org)
Food Co-op 500 (www.foodcoop500.coop)
Frontier Co-op http://www.frontiercoop.com/
National Co-op Bank (www.ncb.coop)
National Cooperative Business Association (www.ncba.coop)
National Cooperative Grocers Association (www.ncga.coop)
United States Federation of Worker Cooperatives www.usworker.coop
University Of Wisconsin www.uwcc.wisc.edu/info/i_pages/coopdev.html