I'm very busy so I have no time for huge presentations. My idea: Reuse a part of the energy that we use to type on a regular keyboard. With tíny generators in each keycap one could transform that into additional power that is collected and transferred to the battery of the notebook. The good thing: if you are angry and hacking on your keyboard with more effort this will yield even more juice for your working.
One personal remark: please consider that I am already at CeBIT from 28th of February to 3rd of March and have no time for an additional day in Hannover.