Firstly, if you need Wikileaks in the first place, you have bigger problems.
Secondly, Wikileaks actively tries to place itself above the law. No-one should be above the law.
Thirdly, there is little that has been revealed via Wikileaks that could not have been revealed in the traditional way via a free press. Wikileaks may make things marginally easier, but if you're in the business of leaking private stuff only if it's easy, maybe you should reconsider your world view.
Finally, before anyone comes along and tells me how much good Wikileaks does, consider this: they also released the private membership list of an unpopular political party, causing very serious consequences for many members of that party. Whether or not you agree with their politics, that sort of action is way over the line. What about the anonymity of those party members?
I am certainly not saying that no protected speech should exist. Indeed, I am all in favour of a law that protects certain classes of speech, with political views probably the most important class.
I just think that such laws should be crafted carefully, striking a balance between freedom of expression and protecting people from the harm when others abuse that freedom, and that once such laws have been made, they should apply on the Internet as much as anywhere else.
There are complications with jurisdiction in the on-line world, but there is no reason that most of the international community can't reach a consensus on these issues, just as they have on many others before.
I have always struggled with the idea of anonymity as a vehicle for free speech, for three reasons. Firstly, most people who think they are anonymous on-line really aren't, if someone tries hard enough to identify them, so it is often an illusion. Secondly, actively protecting anonymity automatically removes any responsibility from the speaker, whether or not what they are saying is within a protected area, creating a huge loophole in the laws. Finally, while anonymity may have a perceived value in protecting those opposing an undemocratic government, we don't have that situation anywhere in the west (to the point where political dissidents are routinely threatened or "disappeared"), and if we ever reach that point again, the correct response will be one of the three boxes after "soap".