If you are an iOS Developer who develops for jailbroken iDevices or use jailbroken iDevices as your test devices, you can create .ipa installer files from your compiled .app easily using this app.
The only thing you need to do is to drag and drop your .app file and an image as the iTunes Artwork together on this application, Voila, your .ipa file is right there on your desktop. 🙂
You can download the application from here
This project is open-source, you can find the source on GitHub.