So I've been an avid roleplayer since I was a wee little kid. Not tabletop roleplaying like Dungeons and Dragons or MMORPGs like World of Warcraft, but real, down-and-dirty play-by-post forum-based roleplaying (yes, I know -- gasp! -- with actual writing!). It's more like collaborative storytelling, where each person posts anywhere from a paragraph to a page of text for the other person to read and respond to. Most RPs occur on dedicated RP forums, but they can also happen over IM or email.
So… is anyone else interested in this type of RP? If so, what sites do you use? Or is it something you used to do, but not anymore due to lack of time/interest/a partner who can write?