Another piece on RIM by the Guardian, this time reporting that the UAE were after BlackBerry messaging info, because of its use in spreading gossip about high-profile Emiratis. These quotes (translated here) from Dubai's police chief, Lt.-Gen. Dahi Khalfan Tamim, where he says the ban was also "meant to control false rumors and defamation of public figures due to absence of surveillance", tend to confirm that.
Meanwhile, not to be outdone, Oman has banned Virtual Private Networks (commonly used to give correspondents access to the company network back home). Not surprising, given that Oman supposedly already bans the use of encryption. Will it go after the banks next?