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A simple tool to encode/decode URI components (source). Also works on text in the address bar. See Percent Encoding for more information.
http://www.google.com/search?num=50&q=uriencode&as_qdr=all&tbo=1
http%3A%2F%2Fwww.google.com%2Fsearch%3Fnum%3D50%26q%3Dpercent%2520encoding%26as_qdr%3Dall%26tbo%3D1