I've tried the provided source code from O'Reilly and it doesn't run either. However, there is some crash report on the log:
2010-02-04 14:53:55.631 DrinkMixer[21300:207] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSCFDictionary isEqualToString:]: unrecognized selector sent to instance 0x1905310'
I've checked Chapters 1 to 3 and 5 by me and/or O'Reilly which compile and run normally.
I have recently updated to SDK 3.2 beta, so I suppose it could be related to that? I've tried to compile against older SDKs (3.0, 3.1, 3.1.2) but that either doesn't work or I haven't figured out the right combination in XCode and the iPhone Simulator.