The Deal on Gamestop.com is the name of a new daily offer they will provide, which will provide a "great offer of the day" as well as other price drops and bonuses (thanks G4tv). They kick things off by offering a 25% discount off of the price of all used games, as officially determined by their used game price dartboard. Also, weekend deals on Direct2Drive include Warhammer 40,000: Dawn of War II for 50% off and Braid for $5.00 off. They also remind us that Aion preorders grant access to the Aion beta, while Dragon Age: Origins preorders (US and Canada only) will earn you an exclusive item. Finally, GOG.com is offering 20% off all weekend on chess games. This post from yesterday outlines additional weekend sales on Steam, GamersGate, and Impulse.