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The tapbot products really are awesome. These two guys wanted to create their own interfaces for their products from scratch, and they succeeded.

However, I think it's worth noting that the tapbots programmer has been writing objective-c since the 80's. Even with that amount of experience it took two months of "nights and weekends" to create their weightbot app. If you're just starting with objective-c / cocoa / iphone development, I think it's unrealistic to expect to achieve their level of quality in as short a time.