Here's the story of another school board (that's three in one week) that is telling organizations like the Americans United For the Separation of Church and State, and Freedom From Religion Foundation, to stick their (empty) threats of lawsuits about invocations:
 
http://www.newschief.com/article/20110126/NEWS/101265133/1021/news01?Title=Schoo l-Board-won-t-bow-to-anti-prayer-group