Groupon Reserve promises to give diners a discount off their entire check without requiring pre-payment or vouchers. Reserve is now live in ten US markets – Atlanta, Boston, Chicago, Denver, Los Angeles, Miami, New York City, Philadelphia, San Francisco and Washington, D.C., though it says plans are afoot to expand to more cities in the US and beyond by the end of 2013. At the time of writing, discounts are being offered in 600 of the country’s higher-end restaurants, including Le Cirque in New York City, Chaya Brasserie in Los Angeles and db Bistro Moderne in Miami. Get the full story at The Next Web