John Gruber wanted an app that would allow one to turn any command line script that accepts input into a service (you remember services, don't you? They live in the Apple menu and don't really do to much). ThisService was born to fill this need.
What the heck would you do with this free app (though donations are encouraged)? Well, you could write a script that, for example, takes the ISBN of a book and based on that returns a bunch of information from Amazon's webservice. This way you could be surfing along on a publisher's website, see a book, highlight the ISBN, hit the shortcut, and know what Amazon is selling it for. This is the first example that came to me, but the uses are pretty limitless.
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