There is now a private messaging system on the website.

 However, there are no alerts for when you get a new private message - so it'd be a good idea to make a habit of checking them daily. I'm currently looking for another Private Messaging system that allows email notification, or an alert on the 'User bar' stating that you have x new messages.

 For now, until users get the hang of the PM system, I recommend using the Forums to contact other users.