Haha 
Just to see where all the action is, or to know when some1 is online to ask a question and have more chance for a quick reply 
you know what i mean, you see, it is not meant as a chat, more as internal email within MRC
Who's online: Wolverine_nl, wolf_, hap
you click on hap's name and you sent hap a personal internal message, then if hap is still online, hap should see a little number appearing next to his name and after clicking on it, reveals the message and is able to reply on it.
it is technically very intense to get it around the excising MRC, it would mean a internal messaging system.
....yes maybe too much
Internally we have debated about a private message system, and decided against it. We'd like to have the communication in the open (forums, wiki) as much as possible, and having a private message system would likely result in private discussions in stead of on our forums.
Enabling the personal contact form for each user is about as far a private messaging system as I'd like to go right now
Editing (one's own) comments became impossible? 
Also still missing a preview option for comments (like any other site has).