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I had a similar background and it took just a couple of weeks to get the basics down. I would just start by trying some of the online tutorials for obj-c/iphone and/or an iphone sdk book.

Start writing a few simple apps and you will be up to speed in no time.

Also, if you are interested in gaming the cocos2d library is very helpful.

If you want to get your feet wet in Objective-C and Cocoa-like API's (assuming you don't have a Mac), I suggest taking a look at GNUstep: http://www.gnustep.org/.

thanks for the advice

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