Apple has pushed out the iOS 4.3 beta 3 firmware’s IPSW for iPad, iPhone, iPod Touch and the Apple TV 2G. A few days ago, the beta 1 and later beta 2 were released to the developers. This is the third beta of iOS 4.3. As it is also a beta version, it is only available to the developers, that is who are there in the iPhone Developer Standard or Enterprise Program can get a piece of the iOS 4.3 beta 3 firmware IPSW.
Download iOS 4.3 Beta 3 IPSW from here