Click once to get the slapper moving, move it off to the side of the screen, and bring round to the left without moving it over the game window, then quickly bring it onto the screen from the left...if you do it right, you can easily get over 1000 miles
Argh. I figured this would be a good time to install Flash on my Linux install, and now I'm in a world of pain. I could honestly slap the hell out of something!