Try http://wikileaks.ch/ which points to the numerical URL http://18.104.22.168/.
UPDATE: Now also via http://wikileaks.de/, http://wikileaks.fi/ and http://wikileaks.nl/.
All mirror sites can be found listed at http://mirror.wikileaks.info/, also listed over the jump.
The subject of the twitter hashtag #FUJoe, introduced by others, is US Senator Joe Lieberman.
See also Daniel Ellberg’s open letter to Amazon and the notice posted by Amazon Web Services explaining their decision. Antiwar.com are ending their association with Amazon.