Since there was positive response to my post in jeffmac's Italia! thread when the mTrip travel apps went free, I thought I'd mention that the six Fodor's travel guide apps for iPhone, iPad, and iPod Touch for NYC, London, Paris, San Francisco, Rome, and Barcelona are free today. (I don't know how long this will last; it just happened today).
Here are the links:
These are universal binary, and will work on either iPhone or iPad.