Starbucks is offering 50% off their frappuccino drinks this week between the hours of 3pm and 5pm. It runs through May 16th. They are also offering $1 off a frappuccino if you go and "build" a frapp on their new website -> frappuccino.com
I made my own today in spirit of the promotion. I had a tall, nonfat, double chocolaty chip frapp, add coffee, no whip. It was tasty.