So far, I've never met anyone who was totally different in person than online. But the thing that's interesting is I have a mental voice, reading people's entries, and it never, ever matches up with what their voice actually sounds like. That, and folks are often considerably taller or shorter than I think they are based on icons. =)
Since I'm going to the cocktail party this evening and doing gaming tomorrow, I think I'm going to spend the rest of the weekend low-key and fighting off a cold.