Here's an excellent presentation by Rodd Lucier from Ontario, Canada, whose blog, The Clever Sheep, I can thoroughly recommend. It's all about using Creative Commons licensing to ensure that other people can use your work and ideas without breakig copyright law. If you don't know too much about this important subject this film deals with all the principles clearly and simply. If you don't use Creative Commons your work will be locked down under copyright law for in some countries up to 70 years after your death. Couldn't we save an awful lot of time and expense if we shared our ideas a bit more insteading reinventing the wheel evey week?
See Rodd's blog post, Creative Commons: what every educator needs to know.