Not sure I buy into the story so far, but as I recall Motorola had to close off an entire floor of one of their cell phone labs after there was a very high incidence of brain tumors among employees working there. I don't have time now to dig that story up, but I am pretty sure I am remembering it correctly.
I heard somewhere the radiation from two phones placed next to each other can cook an egg... Not quite sure I buy that though.