Today's daily deal site is Groupon. This was really the original site daily deal site. It works on the premise that companies will give deals to groups that they won't give to individuals and so it created a virtual group through it's website. Each day they will email you one deal either from your local area or online and you can choose to buy it or not. They have had some great national deals including a $50 Gap credit for $25 and a $20 Bath and Bodyworks credit for $10.
To sign up with Groupon just click here.