Short Version: NOM decided to launch a campaign to raise signatures pledging a boycott of Starbucks to show Corporate America how damaging it would be to take a stance supporting marriage equality.
SumOfUs.org, the Human Rights Campaign, and other pro-equality groups raised twenty-five times as many signatures, and presented them and a Thank You card to starbucks. The results of NOM's attempt to get people to 'dump Starbucks' has resulted in showing corporate america that there's really no contest between which side of that issue consumers REALLY want companies to be on.
So now, they want to keep that momentum going and make the message even more clear than it already is. You can go here to print out their Thank You card, which they want people to take to their local Starbucks, and get pics as you present it to them, to post on Facebook, Twitter (hashtag #equaLatte), etc, and continue to magnify the backlash against NOM's idiocy.
Corporations are bound by law to act in the best interests of their shareholders. They need to see how clearly and overwhelmingly it is in their best interests to support marriage equality.
Spread this around. Especially if you're on teh freindface and the spacebook and the tweeter. :B