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Oh, you mean like these?

http://boingboing.net/2010/12/03/wikileaks-blocked-bu.html

Mirroring Wikileaks is not illegal, First Amendment... highest law in the land.

Copyright is an exception, unfortunately.

The government's PR branch has really done a number on you. It's absolutely legal to host or mirror Wikileaks, under any reasonable interpretation of the law; remember that the only way that the government can dig up a case on Assange is to try to label him as a co-conspirator in directly obtaining the information. Just distributing the material is protected -- it's the same thing that newspapers do all the time.

EDIT: On reflection, I shouldn't sound so confident, because I'm not a lawyer. But that's my understanding.

It does seem to be legal, for now. That doesn't mean that the US government is unwilling to, say, question you every time you fly: http://en.wikipedia.org/wiki/Jacob_Appelbaum#Investigation_a....

(Note that Jacob was more involved than simply running a mirror, though.)