Here in Maine, we've been fortunate enough to receive Mac Books for the all the High School teachers. Of course, as with anything new there's a Tech Curve ;) (a time of learning as we change platforms.)
Some helpful sites are
Switching To The Mac: A Guide For Windows Users.
Free Atomic Learning Orientation to Mac OS 10.4 Tutorials
Mac 101: Getting Started with a Mac: http://www.apple.com/support/mac101
Thank you Mike Muir
For more information, check out MLTI High School Teacher FAQ Do