BraveSirRobbin posted an excellent How-To explaining how to install an X-10 (outdoors) enabled outlet. This is a very useful how-to, especially if you don't want people to see you are using X-10, or as in BSR's case, have no room to plug in the appliance module. As usual, the How-To comes with tons of pictures, check it out!
[How-To] Install an X-10 (Outdoor) Outlet
[How-To] Install an X-10 (Outdoor) Outlet