I saw this on Dan's Deals this morning. Beginning at 10 am EST and lasting until they run out of an undisclosed number of codes, Groupon reportedly will be offering 20% off on local deals. Limit one per Groupon account (but I guess you can open multiple accounts, at least if you pay with a different cc number).
http://www.dansdeals.com/archives/41598
At the same time, the cashback sites seems to be having a promo this week, giving higher rebates. Topcashback is at 7%.
Combined, this is a nice discount, if there's any local deal you want.