Is it possible that they've already been shut down and are using the site now to backtrace those who've already signed up  

I've heard TOR isn't 100% anonymous if they can control enough of the servers in the network    

I'm very suspicious with what's happening with no message on the main page.  And no, I'm not a government agent - just a cautious type  

edit:  IMO, the i2p network or freenet would be much better for the silk road site.