No sharp objects here, but let's review what the LAW says...
A land owner, public or private, owns the rights to said land and the rights to grant anyone access and/or use of that land. The law is specifically written in this way so that anyone who wishes to use the land must be allowed onto the land. The fact that land does not have signs "posting" it has no meaning. You must, according to the law, be allowed onto the land, i.e. have permission. If you enter any area without permission, you are setting yourself up for a spot of trouble.
The way this works after a transgression, generally, is that the landowner is approached and asked if they wish to press tresspassing charges, they have that choice. Some may say no, but you can take that chance if you wish. Posting land is a way of advising law enforcement officials that any and all tresspassers should be prosecuted unless they have written permission (charges will normally be issued on the spot in this case, much like a traffic ticket).
Speaking as a landowner and a 'cacher, we all need to have permission from whomever controls the land we use, and to make surethey know others will follow. I must agree with others, however, that you choose what you want, that is what makes this country great. Another peice of this though, is that you should be willing to pay the consequences if caught and prosecuted. This website, however, should not be used to encourage the use of others' land without their permission...
...off the soap box now...
