Like clockwork Apple has released iOS 4.2 beta 3 for iPhone, iPod touch, and iPad for developers, along with the requisite SDK and iTunes 10.1 beta 2.
As always, this is pre-release software meant for developers to test their applications and Apple warns it might prove too buggy or unstable for daily use on your main device. If you don't need it, wait for the general release.
If you do need it, grab it from developer.apple.com and let us know what secrets you find lurking inside! For more, check out our complete iOS 4.2 beta walkthrough.