Groupon is a deal-of-the-day website that features discounted gift certificates usable at local or national companies. Groupon was launched in November 2008, and the first market for Groupon was Chicago, followed soon thereafter by Boston, New York City, and Toronto. By October 2010, Groupon was available in 150 cities in North America and 100 cities in Europe, Asia, and South America.
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Overall, the Groupon services seem to be a great way to save money on things that you were already planning on buying. The only downside is that you have to remember to cancel the service if you don't want to continue using it.