I'd mentioned this some time back in an Excel thread, but thought it warranted a spot here.

Research Randomizer is a free service offered to students and researchers interested in conducting random assignment and random sampling. A simple web form enables you to nominate:

How many sets of numbers do you want to generate?
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How many numbers per set?
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Number range (e.g., 1-50):
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Do you wish each number in a set to remain unique?
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Do you wish to sort your outputted numbers?
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How do you wish to view your outputted numbers?

Output can be directed automatically to an Excel spreadsheet, or viewed in browser.

Alan