Linux in U.S. Schools

Wired has an article on Linux being used more and more in U.S. schools due to the low cost of purchase (free) and reduced maintenance (remote volunteers). Total cost of ownership must be considered but one teacher points out that one third of his school knew Windows, the other third Mac and the remaining third were "not computer literate", so he'd have to train two thirds no matter which way he went. If anyone knows of Canadian schools doing this let me know.