Twitter @earlybird Exclusive Offers are special time-bound deals, sneak-peeks, and events that are promoted by the official Twitter @earlybird account. We partner with select advertisers and retweet offers that they have crafted only for the Twitter community. Our advertising partners determine the terms of the offer, including availability, amount, and price. As with other forms of advertising from Twitter, we are focused on bringing value to our users and will keep your interests in mind as we develop this program.

To get the offers you will have to follow http://twitter.com/earlybird.  You may follow or un-follow earlybird at any time.
First, the offers will be targeted for US.

Will these deals be targeted toward Twitter's many users outside the United States? - At first, many of the advertising partners will be large, international brands or focused on the U.S. market. As @earlybird grows beyond this first early phase, so will the deals in different places.

Read more about EarlyBird here

[Via Webmater World]