GPSAuto
 

GPSAuto is a Windows Mobile Pocket PC (PDA) application for monitoring your current speed and alerting when crossing speed limits. You can use GPSAuto in your automobile (car) for accurate measuring (based on GPS system) of actual speed and getting warning when crossing speed limit (speed limits as well as many other parameters are fully configurable). Unlike it's competitors, GPSAuto offers also automated switching of speed limits based on your actual speed.

Re: GPSAuto
 

i've been using this app for about a year now. it's not bad. could be a bit more customizable with things such as when you are telling it what the speed limit is and the intervals that it lets you choose and a few other things. But definately worth giving a quick look at. Good up!