I dont personally. To be honest I think it is better in some ways to keep all discussion between yourselves on your forum. If I was to sit on Skype or MSN speaking to them each day we would never use our staff room. The email address is the only required contact information.
I like to know how to contact them on the interwebs... like MSN, email etc. I don't go around asking for there postcode and everything D:
all of us are pretty close (like we've been around each other for a while) and we all have an alternate email addy, and phone numbers for emergancys.
While I don't require them to provide me with any sort of contact information, it would be ideal if they did so (and they usually do). If anything, the least I ask for is an e-mail address.
Not a requirement, the most i would expect would be a email address, but im very close to my staff so i have email, msn, postal addresses and phone numbers too.