Today's Groupon (Monday's that is) is for Yak & Yeti, the Tibetan/Indian place that opened in Ball Square a while back. I've been once and keep meaning to go back again. I don't remember finding the food amazing the one time I've been, but it was certainly satisfactory and the people were lovely, and I remember that I left wishing them well and hoping they succeed. The prices were perfectly reasonable, so the Groupon makes them a real bargain.
Full disclosure: I get a bonus from Groupon if you buy via the above link. Though perhaps only if you're not already a Groupon member.