In 1999, Congress approved a bill requiring all federal lands to survey their lands, and try and account for all their fossils.
Over the summer, I worked with the US Forest Service, doing basically that, working to catalogue and plot all the fossil localities in the Forest.
Part of this (the initial part) utilized both satellite images (available through the now greatly downgraded www.terraserver.com), and aerial photographs taken of the forest...these were used to identify potential outcrops, which were then plotted on a topo map, later investigated and mapped with GPS, fossiliferousness recorded (none, poor, high, etc.), plotted on a digital topo, and added to the Forest collection. By the end of the summer (which was the 3rd field season this had been ongoing), the Forest had a complete catalogue, with accompanying maps, of not only all the potential outcrops, but also all of the fossil localities (not data for scraps, but indicated by quantity in the report), with major finds pinpointed.
All public lands are supposed to have done/be doing this, in order for the administration to know what fossil resources they have in their area, where not to build pipelines/roads/dams, and also to help law enforcement in terms of fossil poaching. A lot easier to stop poachers if you know the likely places for them to be. As for accessibility, I'm not too sure. I think that they are available to people associated with museums, but I kind of doubt they'd be really willing to give out that information to just anyone who walked in the doors.
I'd disagree with HP Varner on this one (maybe because I worked on it, so I'm biased). If we know where localities are, it a)becomes harder for fossil smugglers to avoid detection b)easier for us to relocate localities (including old ones; something else that was part of the project) c)allows you to get an idea of what the outcrop might be like before you get there.
I could go on for a while, no doubt, about this, but I don't want to bore you all to death. I think I shall leave it as it is (for now ;)).