Use an IDE cable for Mounting Arduinos
This is a convent trick I have been using which allows you to securely mount one of these boards when you pass the bread boarding stage and decide to just stick the Arduino somewhere for a while. I have found that the IDE cables make the perfect platform for mounting smaller Arduinos on. Even better, some of the smaller IDE cables that are used to connect floppy disk drives have almost the exact number of matching pins. The only think that you have to figure out is where each wire in the ribbon cable connects to because there is two rows in the socket, nothing that a bit of testing with a multimeter cant determine!