Your Favorite Free and Paid iPhone Apps?

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Hi all, I'd like your opinion on the Best Free and Paid iPhone apps out there. I think that the best free app out there is: - Tap Tap Revenge, because of its awesome two player mode, and fast growing list of (free) songs. And, I think that the best Paid Apps are: - Crash Nitro Kart, for it's fun, cartoony race, with very good graphics. - Asphalt 4 Elite Racing, because it has a lot of licensed cars, famous cities, the three steering modes (accelerometer, virtual on screen steering wheel, and 'tap to steer'). So, what are YOU guys' favorite Apps? Cheers, NOTE: I'm talking about App Store apps, not Cydia/Installer ones (requires Jailbreaking your iPhone/iPod Touch), so please do not include any Cydia/Installer Apps, only legitimate apps from the App Store.