LAST EDITED ON Jan-29-09 AT 08:49PM (MST)[p]PM means Private Message. If you look to the right of your name or anyone else for that matter, there are some icons there.
The "double envelope" is for E-mail, the single "envelope" is for PM and the next one is the Profile of the person in question.
PM means it is sent to you privately, no one can see it and you can reply back to the person/s who send them to you.
The way to know if you have a PM is when you login here on MM, the first page up is the Main Forum Page. There will be a small "red flag" at the top left edge of Forum to let you know. Look over and up a bit for the words Inbox Mail or words to that effect, click on it and there you go with the message, enjoy.
Brian