Apple [AAPL] has launched a free case program for iPhone 4 owners, in the form on an application that can be downloaded to your iPhone 4 from the App store.
Once you have installed the application on your iPhone 4 you can then choose a free cases, from a number of manufacturers as well as one of the official iPhone 4 bumper cases.
You can download the app from iTunes, and order you free case, although we suspect it will take you quite a while to get your case. The one we ordered should trun up in about four weeks.
Apple