I've just learned about a new website devoted to military travel discounts: GuideToMilitaryTravel.com. Run by a military spouse, the site includes all sorts of information about discounts at regular hotels, military lodging and travel tips for families. These offers are different from the offers that you can get at your bases ITT office and often are a much better deal.
You can also follow them on Facebook or Twitter, so that you can keep up-to-date on all the new promotions as they become available.