Some ideas for how to engage students of mathematics and hard sciences using online tools are shared in this feature article from the eLearn magazine by Maria Andersen.
http://elearnmag.org/subpage.cfm?section=articles&article=97-1
They include:
- tablet computers with equation writer
- video recording and editing
- jing screen capture that staff and students can use
- training for equation writing software
- free synchronous spaces for collaboration - even when you are not there
- using publisher resources
- toys like Wolfram - The Wolfram Demonstration and Wolfram Alpha
- videos of experts
- emulations of graphic calulators