Can there be too much of a good thing? If you're buying vouchers faster than you can use them, yes. So if you are just too tempted by these deals every morning, cut down the emails and get all of them in one place.
For instance, Yipit puts all of the deals in your city into one email. You can browse deals by category on their site, just restaurants, just fitness or those in a specific price range.
Deals Go Round lets you create a virtual wallet for your deals, organized by expiration date. If you can't use one, then the site lets you sell it to someone else in their online marketplace.
Keep low-tech, common sense tips in mind, too. Read the fine print for expiration dates and restrictions. Do the math, like what you'll need to spend on top of your coupon to pay for a full meal, or how much gas you'll spend getting there.
Don't be afraid to ask for an extension. Businesses often get inundated with customers with these deals and they might be just fine with you claiming yours after the crowds have died down.