It would definitely be nice if a "purchases" section was added to the App Store so you could easily see the Apps that you have purchased and easily refresh them. This may be due to the fact that Apple would prefer you NOT know how many (and how much was spent) apps you have got.
But, Apple is moving a step in the right direction by removing the "Buy App" button from already purchased apps. My daughter inadvertently deleted an app when she told me they were "wiggling", it was difficult to find and redownload. It appeared that I was paying for it again until the Apple minions realized that I already bought it and gave me a pop-up asking if I wanted to add this app for free.
This feature is only working on the iPad so far, but should be easy enough to add to the other iDevices.
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