Also a math (and science) teacher, but at the grades 7/8 level ... similar problems (mostly caused by inadequate servers) and more (can't access personal webspace from home; can't connect home computers/laptops to network at school; school computers have wordperfect while every student has word at home; high schools have word ... we don't) etc.) ... I've got all my preferred apps (firefox, thunderbird, open office) on a corsair voyager stick to deal with some of these. I've been trying to find solutions for years to zillions of similar problems (I don't have an elmo; all I have is a 10+ year-old lcd projector to connect to my laptop ... my next attempt will be to use an adesso cyberpad for lecturing/notetaking purposes (as a virtual whiteboard ... I tried with a watcom graphics tablet a few years ago but it just didn't work out)