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I've downloaded loads of apps, some free, some paid, but recently i got Things and it's the only one I actually want to use. I was reluctant at first because it is expensive for a simple piece of software, but quite frankly, that's exactly why I am using it. The simplicity is the key to its usability. I paid £30 for a desktop version first then got the iphone versin for 5.99 and now sync the two.