For those of you enamored of the Apple IPhone or its litte brother the ITouch, the App store provided by apple may be your only avenue for finding those beloved features to make you phone work.
Yet, Apple draws many complaints because of its often "tyrannical" App store policies. Some make it through, while many others do not. Making matters worse, those successfully lighting in the App Store rarely make enough cash to justify their investment of time and money to create the App. Apple makes money regardless of how well an app sells because they invest no money nor time (save the approval process) to create the app.
What to do when you blow your life savings to create an app that fails to curry favor with the gatekeepers at Apple? You go to market anyway--just down the street at Cydia.
Cydia is the marketplace for all the misfit apps.
This was bound to happen sooner or later. Apple established a system demanding high investment for entry, low chance of return, and they topped it off with a gate-keeping system known more for whimsy than for integrity.
The market will always find a way around monopolistic aggression. When the market doesn't Antitrust Law will.
Either way, Cydia is the result.