If you have a PDA then you could use the GPS Speed Sentry software to reflect the image on to your screen at night while driving. Although I havent checked it out myself yet, I assume that there is a way to mirror the screen so you are not looking at everything backwards. This only works at night as you do not see reflections too well through the day. By doing this you can keep your eyes on the road while checking out your speed and other details.
Via: Docfiles
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