I agree. I definitely wonder what other people think. (I wonder where StommePoes and Ralph and some of the other "regulars" are at?)
Okay, but put yourself in the shoes of an End-User.
Let's assume for a minute that I actually get my website done - a little "fantasy" in one's life never hurts, right?!
As an end-user, what would you say if my website made it so you could only send a Private Message to one person at a time?
Would that be a major annoyance to you?
Would it cause undo stress in your life?
How do you, Mike, personally use Private Messaging (if at all)?
Do you use it like I do, to have offline, one-on-one conversations?
Or maybe to just send a cutesy note to one of your acquaintances?
OR, do you have a large social circle where you want and need to send the same PM to 5, 10, or more people at a shot?
(BTW, my goal is to NOT create FaceBook or Twitter. I just want a way that people can talk in privacy - still in the context of my website - when they need to. But I am not offering a free E-mail or Social-Networking service via my PM module!!)
I use the Forums for group discussions, and PM's for one-on-one conversations.
But maybe others don't do things that way...
And since I'd like my website to be user-friendly, it is important to get a sense of what the masses expect (via you Web Design experts here at SitePoint)!!