Well, seeing as how I've dealt with death a few times, both in this community and the SW community, then I unfortunatly have some expierience. How I would react, though, depends on how well I knew the person. If the person was a really, really close friend, I'd be devastated. If the person was an acquaintance, I'd mourn their death but at the same time realize my own mortality. Death on the internet is tricky. I left several forums that Gary and I were members of after his death. I left the SW forums after a member there died. I may return to the SW forums after a while.
As for plans on what to do in case I suddenly dropped dead at the keyboard? Well, it's not a solid plan, but my brother knows many of my friends, so he'd tell them, who'd pass the word.