We've added a new private messaging feature to the Forum. It's called "Whispering" and it appears as an option every time you write a comment. Just type a member name in the "Whisper your comments to" box and the comment that you write will ONLY be sent to that person. Unfortunately, the software only lets us message to one person at a time.
When you send a whisper the comment that you wrote shows up in yellow on your screen. When you receive a whisper it shows up as pink.