I bet one of them wants to make the first trojan for the iphone.it won't happen. this is the exact reason why iphone apps will only be sold through the iphone app store controlled by apple. apple has super tight quality control over these apps and they won't be sold without apple's seal of approval.
Famous last words. You've heard it here first, folks.
Despite Apple's draconian measures in attempting to milk developers for every dime under the guise of security and stability, malware most certainly will be distributed at some point via the AppStore. Developers certainly don't have to provide the source code for each app to Apple before distributing, all they need to do is submit some very personal info (which can be faked), pay a $99 fee, hope for approval, and off they go.
Right now a very limited number of people (i.e., commercial enterprises, possible some well known small-time Mac devs) are getting this approval, but this is supposed to change. Apparently even I should be able to get approval, and I only work for a charity.
Once the floodgates are open, it's a simple matter for a sneak to distribute some form of malware. Most likely this'll be something that won't do any damage right way, but will be timed to go off in the future so that a number of people download it. When Apple realises that a piece of software is malware, they'll certainly void the certificate, but that won't reverse the fact that malware had been officially distributed.
All Apple is trying to do is make as much money as possible without any consideration for the consumers that are buying the products. Like charging $1 (or however much it was) to download a ringtone for the iPhone for a song a person already owns. Ridiculous, yet some Macolytes backed Apple. Now they've satisfied Macolytes by allowing 'free' software, but does anyone actually think this means truly free software, or just cut-down versions of paid-for software so that people can try and then 'upgrade' to the full version?
No, this has nothing to do with security and stability, as both will be affected negatively despite the whole certification process. Indeed, the whole farce is going to give people a false sense of security, making them (e.g., you, think that anything on the AppStore is clean and wholesome, which only time, not Apple, will be able to tell.