Tchart Development has just released the newest version of its Speed Sentry application for GPS-enabled handsets.
The latest release as before warns the driver to slow up when the road speed limit is exceeded, and also gives warnings about upcoming speed cameras, so you won't get flashed speeding. Cool, huh?
In addition, Speed Sentry monitors your vehicle's speed, showing current/top/average, as well as distance, elevation, position, bearing and more.
A great helper for all you speeders.