I’ll be adding a cocoa Binding example as soon as possible, I have it here https://github.com/seanlilmateus/Temperature-Converter; it can also be useful on how to NSValueTransformer, NSUserDefaultsController and NSNumberFormatter! the Binding are made with IB and manually/programmatically.

I've got corporate sponsorship, and financial incentive to complete "one a day" until the end of the month.

Damn, you'll rock it out ;-)