I have mentioned iTunes U in a previous post and I want to revisit this great resource with this video introduction to iTunes U.

Applications for Science Teachers: Many audio and video lectures for sharing with high school science students. Science teachers can review science content individually or work as a science Professional Learning Community (PLC). Imagine having immediate access to science experts from MIT, Yale, Stanford, etc at your fingertips. I can imagine this resource being a key part of a teachers professional development plan.