Brrrr. Reading this blog entry about stalking set my teeth on edge. (Marginally NSFW link).
I've had my share of trolls, goofballs, and weirdos in my life sending me very uncomfortable emails and such. I've taken one seriously enough to call the FBI (it turns out to have been a spam of a sort), but I suspect many outspoken skeptics have had to deal with this at some level.
What a world. Threatened over ideas, threatened over actions, just threatened. Eternal vigilance.