Where is the user data associated with an iPhone app stored? Is it stored within the app's .ipa file? For example, I use Weightbot. Is all of my personal data stored within the Weightbot.ipa file, or is it stored elsewhere?
iMac (21.5-inch, Late 2009, Week 47), 3.06GHz, 4GB RAM, Mac OS X (10.6.2), iPhone 3GS (16GB), Apple TV (40GB)
That's correct. App data is only stored on your computer in your phone's backup file. (You won't be able to transfer the app to another computer, if that's what you're thinking of doing. It won't work.)