Crackulous: Crack iPhone Applications from AppStore using Crackulous
This application is absolutely free, offers full GUI support through the process of cracking an application, and cracks multiple applications at one time.
Crackulous is based on the xCrack concept which is aimed at doing the same thing (cracking AppStore apps) but it makes the process much easier with its GUI support. The applications has been out since 3 months now but shared and distributed only to a closed beta group, however, because of its success in the closed beta the application was released for everyone to try.
Watch the video below to see this application in action! (Video is a little blurry)