Casual Observer, my understanding is that the Supreme Court is right now considering two cases that involve ten commandments displays in court houses. From what I have read, they will probably make a ruling on it in June. There are some important standards for adjudicating establishment clause cases, and I guess that will be what the Supreme Court will be looking at when making their determinations. These standards involve, among other things, the question of whether or not the presence of religious diplays in government buildings will have the effect of promoting any particular religion or religions.

This page has links to some of the cases that have established the standards that courts are currently using to make these determinations:

http://members.tripod.com/~candst/tnppage/eclauidx.htm