Try diawi . I find it very simple and very convenient to use. There is also no need to wait in the queue type entry. When you open it, just drag and drop the .ipa file and preparation profile. To check if your application is installed, simply add your email identifier in the specified area and you will receive a confirmation letter about the installation of your application. To install at the end of the tester, they just need Safari to install the application and profile.
Below are the steps to create the .ipa file (xcode 4.2)
Select your iOS device> Go to Product> Archive> Share> Select iOS Application Storage Package (.ipa)> Specify a path to save.
Easy done !!!
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