Sparrow has certainly made a name for itself as the Mail.app alternative on both the iPhone and Mac. Although acquired by Google, the co-founder of Sparrow, Dominique Leca, just announced that Sparrow would be updated to support the iPhone 5 soon.
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With iOS 5 and iCloud it became relatively easy to add in document loading from the web. The problem is that many users are using services other than iCloud to store their files
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