This post leads to Coupons.com, which is an advertising company. They require you to install software on your computer which is questionably close to "spyware".

Here's what I found on a site that looked at the Coupons.com software
http://www.benedelman.org/news/082807-1.html

I recently examined software from Coupons.com. At first glance their approach seems quite handy. Who could oppose free coupons? But a deeper look reveals troubling behaviors I can't endorse. This piece summarizes my key concerns:

* Installing with deceptive filenames and registry entries that hinder users' efforts to fully remove Coupons' software.
* Failing to remove all Coupons.com components upon a user's specific request.
* Assigning each user an ID number, and placing this ID onto each printed coupon, without any meaningful disclosure.
* Allowing third-party web sites to retrieve users' ID numbers, in violation of Coupons.com's privacy policy.
* Allowing any person to check whether a given user has printed a given coupon, in violation of Coupons.com's privacy policy.

In addition, I found the following sites with information about deceptive practices of Coupons.Com:
http://probargainhunter.com/2007/09/30/downloadable-coupons-come-with-sneaky-extras/

http://www.wired.com/politics/security/news/2007/08/coupon_security

http://www.wired.com/politics/onlinerights/news/2007/08/coupons

Also, this topic is now "around the campfire" where it's better suited to further discussion.