Wootalyzer - a wonderful program that allows you to track many deal-a-day websites.  You can set alarm and pop-ups to alert you when new deals are available.

WooTTV - a community of Deal a Day lovers.  Come watch with us every morning at 9:45 AM CST. 

DealaDayTracker.com - a listing of many deal-a-day websites with their current deals, pricing, and availability.

DealSucker.com - another great site with deal-a-day listings.  This site has discussion forums and you can even link a deal you find to fatwallet, slickdeals, etc. 

DODTracker.com - another site listing deal-a-day sites but also list many other bargain sites.  Very well organized site. 

TodaysDOD.com - a deal a day tracking site that lets you add your favorite deal to your google homepage, very useful!