Butterflies in Education 
This site has links to over 50 schools who have butterfly-oriented projects going on at their school.

Welcome Back Monarchs
This is a thematic unit divided by subject areas.  Ideas include charting butterfly routes to Mexico and discovering how air moves.

What Do You Know?  
This KWL lesson has a neat idea for creating a butterfly exhibit at a school.

Butterfly Curriculum  
Use this lesson to teach your students about classification, anatomy, life cycles, and ecology of butterflies.

Life Cycle of Butterflies Module
This site has activity ideas and a very long book list.