So far Wikileaks actions look more embarrassing than endangering to me. Wikileaks gained credibility with lots of most likely real leaks - it's probably becoming attractive for seeding disinformation with false leaks. Even the publishing of real leaks can produce advantages for the embarrassed party, such as "See, we do in secret mostly what we told you in public!"-type of messages.
Now it's getting really interesting, though:
By Rob Pegoraro
The credit-card firm's [MasterCard] Web presence has been largely unreachable for the past few hours after a coordinated attack intended to punish it for refusing to process donations to WikiLeaks.
Reports such as TechCrunch's post indicate the "denial of service" operation was coordinated through 4chan, a free-form message-board site that's been used to arrange numerous other sorts of Web mischief and sabotage, as well as a separate effort called Operation: Payback.
This sounds to me like it's turning into a cultural war - establishment vs. sub-40ish pop culture. The parallel to conflicts between government and extra-parliamentarian opposition in countries such as Iran is interesting.
This is also interesting (and adds to the embarrassment of the leaks!):
Journalism professor and media critic Jeff Jarvis grumbled that he could use Visa and MasterCard to contribute to the Ku Klux Klan -- but not to WikiLeaks.
In any case: Don't mess with crowds which can self-organize - unless you're ready to endure the pain. There's going to be a huge backlash for the anti-Wikileaks/anti-Assange actions. They probably knew that this could happen and delayed the concerted efforts against Wikileaks' hosting and banking providers for exactly this reason.