seized by who ?
How can that be done ?

Its often impossible to log onto it. Wont they just move the URL or something.
It needs someone with more technical knowledge on the way it works, like Knock might know.
I'm not sure about the Onion stuff, it might be different, but in the "normal" web there several ways to do this.
One method requires the co-operation of whoever operates the
name server for the domain. Domain names, e.g.
www.bluelight.ru, are converted to IP addresses, e.g. 93.189.134.5, before a site can be accessed (
name resolution). A name server performs name resolution - when you type
www.bluelight.ru your computer makes a DNS (Domain Name System) request to a name server first to get the IP address, then sends the web browsing (HTTP) request to the bluelight server using the IP address. The operator of the name server can map the name to a different IP address, like one that the FBI owns, which would then serve the page you're seeing instead of the proper site.
A bit like getting BT to change someone's entry in the phone book.
They could also locate the server physically, unplug and plug their own one in :D More legwork involved though.
If they've done it with a DNS change then yes, the site owner can just use a different name but they have to get that name out to people somehow. But whatever the FBI do, short of putting the site owners in custody, the site can be put back one way or another.
Is this thread even allowed though :D
edit: fucking ninjad; so they used the "lock them up" method (although just locking them up won't take the site down, of course, they'd still have to do something like I've said above). Yeah, not much they can do about that! Guess the thread is OK too then

well most of it,
I'm going to be editing some posts...