Oh. It was you yourself Muttley.
Not may others there seeing the awesome gadgetness potential of this idea though...some poor soul even suggesting a mechanical clicker was a good way to count laps in a pool.
Clearly the shades, hrm, gps bit is essential. Maybe a virtual partner could be added. Choose a Paula Radcliffe visual to be running at the pace you want.
Substitute anyone else for Paula of course...would we run better keeping a visual of Beyonce for example just in front of us...?