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!