Co-op Ideas
Homeschoolers have a great variety of quality curricula to use, many of which can be easily adapted for teaching in a co-op. Here's a list of homeschool curricula that work great in a homeschool co-op.Please be sure that you follow the publisher's guidelines for copying pages from their books. Some publishers allow copying for your family, but not for a co-op group. Other publishers will grant special permission for copying if you request it.

Institute for Excellence in Writing for grades 4 and up. This curriculum is very popular with homeschool co-ops because it is easy to use, enjoyable and excellent at teaching writing skills! My own daughters have used it at home and my co-op uses it every year.
IEW even has a yahoo chat group for Co-op teachers using their products. http://groups.yahoo.com/group/IEW_Co_op/
Apologia Science books including Exploring Creation with Astronomy for elementary ages and Biology, Chemistry, Physics, for high school students.
Mapping the World by Heart class for grades 7-12.
A History of Science by Beautiful Feet for grades 5 and up.
Story of the World (Volumes I-IV) by Susan Wise Bauer for grades 1-6.
Great Science Adventures for grades 4 to 6 using the series by Dinah Zike including Discovering the Human Body and Senses, World of Plants, World of Space, etc.
Tapestry of Grace by Marcia Sommerville
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Homeschool authors and publishers: If your curriculum would work well in a homeschool co-op, please e-mail Carol Topp here to be added to this list.