As per request some useful free stuff that schools could use. This site has some free ebooks-
http://www.brainybetty.com/freebooks.htm

This link will give you some ideas for music for use in schools. Very handy for the un-musical like me!
http://www.brainybetty.com/soundsforpowerpoint.htm

On the whole Brainy Betty has loads of useful things that teachers could use, most of it for free.
This site has a lot of applications too:
http://www.schoolforge.net/education-software/educational