Quote:It, however, has a really-really excellent feature: AppFastIn, which allows you to install IPA files on non-jailbroken devices without (!) ever touching iTunes on the desktop. You just collect the IPA files otherwise authorized to be used on your mobile device, press the App Install (AppFastIn) button on the toolbar, navigate to the directory your IPA files in (you can just transfer them from your regular computer, registered with Apple, to your other ones, not registered in AppStore, by simple file copying – on the Mac, they're at /Users/username/Music/iTunes/iTunes Media/Mobile Applications), select one or more (!) of them and click Open. The IPA files will be quickly deployed.

Note that this will only work with IPA files you've purchased from Apple and in no way breaks any kind of license agreements.