This sounds like a really interesting idea: http://www.sci-tech-today.com/news/Teachers-Go-Online-To-Sell-Materials/story.xhtml?story_id=030003O0LVTC 
Teachers are sharing their curriculum ideas and materials while making money on resource sharing sites. It's working out for teachers because it is saving them time and money while giving them a way to make some extra income. Some administrators seem to have a problem with it, though, because some schools have policies in place that prohibit teachers from selling anything they develop while on district time. One administrator in the article said that materials created on the teachers' own time could cross a grey line, depending on the material and how closely-tied it is to classroom work.
What do you think about these curriculum and resource sharing sites?