Do you use the Private Message System? Why do you use it? Whom do you often PM? While we're at it above or under?

Added flair: Send a private message to the user who posted above you!

EDIT: I used to be a big user of the PM system, now it's been hurt a bit by MSN, however I still PM with a lot of peeps, okay, well, some peeps. And I mainly use it for not so important EoFF Affairs.