Launching Maps from Address Book
Need fast directions to a contact's location in Address Book? By Control-clicking on the contact's address and selecting "Map Of" from the resulting menu, a Google map displaying the location immediately opens in your browser.
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Just depends on what sort of data you're storing, and your comfort level with storing that data with a third-party.
And on that topic, my bet is that we'll see an iPad app at some point, but not an iPhone app. But who knows!