While everything else is tanking, software developers' key to success may just be in their pocket. Some techies developing applications for iPhones are hitting the jackpot—and quitting their day jobs as a result. Apps for the ubiquitous iPhone run on Objective-C, a coding language that isn’t too difficult to learn, spawning a legion of hopefuls looking to strike it rich. One man who developed iShoot, an artillery game, has earned $800,000 in five months, and quit his day job at Sun MicroSystems as a result. Then there’s iSteam, which fogs up the face of an iPhone like a bathroom mirror, which earned more than $100,000 for its developer in three months.