As far as I know, there is no official cerification program for Mac or iPhone programming. The best certification you can have is a working program that people like to use, I never really saw the point of being "certified" by a piece of paper.
I am developing some application and will let u know when people will start using it
I needed certification to add value to my profile. If there is any other things that i should learn to be a perfect Mac Application programmer. Please let me know.
HiRez is right. There's no official certification that I know of either; but the Mac developer community is still quite small. If you develop a popular, useful app, your name does tend to get around.
I would definitely say that if you're seeking employment, having an example application that shows mastery of Cocoa (obviously you'll show a mastery of a subset, not everything), and some concepts like Core Data, etc. will take you further than a certification. I may simply not be seeking these types of jobs, but I've never seen MCTS/MCPD/MCAD/MCSD required for a Windows programming job... most certifications i know of are geared towards the IT side of things.
In any event, learn to program OS X and earn the skills you might imagine would be needed to get a certification and you should be fine. Actually doing whatever task a certification is meant to prove you can do is better in my opinion than the certification itself, which can be come by surreptitiously.
As far as I know, there is no official cerification program for Mac or iPhone programming. The best certification you can have is a working program that people like to use, I never really saw the point of being "certified" by a piece of paper.
As a programmer and somebody who hires other programmers, a few certifications can be a good thing. It indicates somebody who takes the initiative to train up on something. As long as I know the certification isn't a joke, I like to see some of that on a resume. I also know that I've taken a few that challenged me to really solidify my knowledge in certain areas.
Edit: on the other hand, not having any certs isn't a deal-breaker either
Of course, for Mac programming, there is no certification. Probably because the mac development community is very small in comparison to Windows and Web-based development. Very few business apps are written for the Mac.