Those from 9to5Mac I claim that with the release of iOS 5 beta 2 using a Mac an iDevice can be entered into Recovery Mode using a Wireless connection and a Mac. They do not detail the method by which this can be done, but they claim that RecBook could be one of the applications capable of doing this. The information is not confirmed by any member of the Dev Team or any other application developer, so I don't think it's true and I don't really see how this could be possible.
UPDATED: It seems that for now it's just a beautiful dream of those at 9To5Mac.
