Really nice list of sites..but there are many other big names playing in the same area such as:

http://www.retailmenot.com/ (good coupon site) , http://www.dealnews.com/ (deal site) , http://www.cheapdeals101.com/ (deal site) , http://www.techbargains.com/ (electronics deals only) are great site to visit.....THanks for sharing good info....