Hey, (copied to dez, a researcher in software in education and a GNU/Linux user)
Have a look at Freeduc, at http://www.ofset.org/freeduc/, by the Organisation for Free Software in Education and Traninng (ofset).
I've used some of this and it's godd in a limited sense.
I got it as a CD on the cover of Linux Format over a year ago. If you can get a copy of it burnt for tomorrow, it would blow some teachers' minds, I'm sure.
One thing I've found out from helping in a school is that though teachers may not know a lot about technology, they know a hell of a lot about education. Some of the knoppix and freeduc stuff is good but has little educational value. Assume that you are answering questions like * "What is the point?" * "What strands of the curriculum does this reinforce?" The teaches I worked with know that technology has some value in education and I think that they were correct to look for proof as to it's value. The only value I could prove to them was that I could show students how to use technology using Free Software. I couldn't even help with their understanding of Maths, etc.... Even though the vast majority of educational software tries to teach - it doesn't.