I wanna develop a iphone/ipod touch app

If you're looking into a serious reference check out iPhone App Development: The Missing Manual (http://www.amazon.com/iPhone-App-Development-Missing-Manual/...). It covers so much and then some, it's truly the holy bible of iOS development work.

Otherwise try checking Google: http://www.google.com/search?q=develop+iphone+apps

This is the best site I have found, http://developer.apple.com/devcenter/ios/index.action