As well as facing possible antitrust claims in the US, the European Union is now taking a look at Apple's closed-shop practises—with EU Commissioner Neelie Kroes claiming makers "cannot just choose to deny interoperability with their product."
The locked-down nature of Apple's App Store was specifically mentioned by Kroes, who also said that "consumers need choice when it comes to software or hardware products". And she doesn't mean buy a DROID instead.
Apple ought to be rather concerned about the rampaging commissioner, as she has a track record in winning EU antitrust cases—Kroes helped the EU whack Intel for over a billion dollars in '09. [Rethink Wireless]