would be awesome..... for example... you have 52% battery.... you are late to catch the train... so you put your n900 in your pocket and start to run..... when you are fast enough you will catch the train and through the movement of your leg your battery will be recharged to 55%....

thats great ...

about 2 month ago i ve read about a battery witch charges when it is in range of a wlan.network.... combine these 2 technologies and you will maybe loose 250-400mah beacause of lost space.... but your battery will last longer beacause of movement and wlan....