Yes I have heard about it all week. The transportation Sec as Bryon said proposed it and the idea of a "chip" in your registration, a gps chip. Big uproar about how the government would then have the capability to track your every move. Also someone said something about how the government can't manage something else and they intend to be able to manage this properly? It was proposed to charge .0025 cents per mile, I figured at what I can write off for school and business with what the government allows for business mileage it would'nt bother me, probably make out better.
I think NC is gonna do a study on it and a few other states are looking into it the last I heard(read), but on capitol hill I think they have pushed it back into the closet last I heard.
Heres a good link that explains it and then many of us post our thoughts......
http://www.dieseltruckresource.com/dev/showthread.php?t=233814