About three hours since this post was created, the Tor server admin in Ireland has been arrested, and the tor network could possibly be shut down although I doubt the Federal Government will win the court case with almost nothing to go on other than the fact that they've caught someone (who doesn't know how to use Tor) attempting to perform illegal activity on the Tor network.
http://news.cnet.com/8301-13739_3-9779225-46.html
I can understand catching pedophiles, etc; but there are many other networks of people in oppressed regions that use Tor as a haven of free speech, and the FBI closing Tor as a whole would be a political mess, and a tragedy for populous looking for some sort of freedom.