Just because I like throwing gas on fire, what are people's thoughts on:

Airspace----how high AGL should private ownership go? Should commercial airlines at 30,000 feet get ROWs to cross private?

How about NAD 83 vs WGS 84, VS other coordinate systems. I believe most federal and state agencies utilize NAD 83 but WGS 84 seems to be the default system used by GPSs. Usually there is only about 36" difference between the systems, but that is enough for disagreement whether someone is trespassing or not. In some areas there can be somewhat substantial differences between coordinates using the different systems. I have seen it vary 20 yards in some places that I am familiar with and I wouldn't doubt it is quite a bit more elsewhere, though I guess my mapping software my actually be at fault vs the datum.

Let's also not forget that coordinates change over time for objects which are fixed in the ground.

GO!