I got an e-mai on April 14th that stated:
Your account ending in: ****
"From April 1 through June 30, 2010, you can earn an additional 2,500 miles each months − just by using your Continental Airlines Credit Card for all your purchases. You'll earn bonus miles based upon the number of purchases you make − up to 7,500 bonus miles.*
Start earning more without spending more − make your Continental Airlines Credit Card the only card you use."
It also stated that I was automatically enrolled.
So far I've made 6 donations!