It was bound to happen, but no one knew when. Sony quietly released firmware version 3.42 tonight, and with it, the ability to block ALL USB-exploited hacks. Since the update is a mandatory one, you MUST have it to retain PSN connectivity and future titles. The blocks had been confirmed by exophase:

We can confirm that all variants of the USB-hub emulating exploit (PSFreedom, PSGroove, PSJailbreak) are no longer functional in firmware 3.42.

I’m glad we’re seeing something come out of this finally. At least they didn’t disable the USB feature :P. Other than that, there’s no word on any new features.