I've never hid the fact that I have an online journal (or blog—I'm not entirely sure of the difference myself) but I've never really gone out of my way to announce it at work, given some of the stories I've read about [1] (even Mark was affected by a previous job—that's why he no longer blogs).
“Sean,” C, my boss, said, “about your blog … ”
Uh oh, I thought.
“Could you change my pseudonym?”
“Excuse me?”
“I don't want to be known as simply ‘C,’” said C. “I'd rather you use ‘Smirk.’”
“Oh.” Certainly wasn't expecting that. “Okay.”
“Great,” said Smirk. “Keep up the good work.”