I was just wondering if there is a tutorial out there that explains a good way to advertise your online multiplayer game. I recently finished a project of mine and tested it out. I have a site and forums up and running and would like to advertise for it to get it known. Can anyone list some sites that will provide me those options? Any help or suggestions are greatly appreciated. Thanks.

Try www.mpogd.com. It is an online games directory, and we got a lot of players from them.
But in order to be able to help you more, you might need to post some details about your game.