I've posted a new build for Private Messages in the downloads section (members only).

New Functionality Includes:-

• Tidy up of CSS styles and defaults to blue.
• Group Ingregration for 3rd party modules wanting to send a message (Pass a querystring value of SessionLoad=1 and populate Session Variable "UserIDList" with a comma delimited list of User ID's)
• Added an additional user option on the preferences -> notification screen to disable the popup notification.
• Added a forward email notification template in "View Options".

Thanks again for all your feedback!