Access to all of your local Groupon deals, even the ones that don't reach your mailbox. Find out about deals in other cities that you can participate in. Uses Groupon API and offers email support.
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flightwise (formerly fboweb.com)
RSStalker for Amazon
Yahoo! Search API Tutorial
APIs, mashups and code. Because the world's your programmable oyster.
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.