I just posted a thread (that seems to have been deleted for some reason - along with on about those Scottish heart attack data being bollocks) about the Canada stun gun death.
Guy was tasered on video and died:
Video: http://news.bbc.co.uk/player/nol/newsid_70...sb=1&news=1
Story: http://news.bbc.co.uk/1/hi/world/americas/7095875.stm
They aren't "safe" or even non-lethal, just safer and less lethal than conventional guns.
And as I've said before we've already had our first police stun gun related death in the UK.