Amazon has announced that they will be opening their appstore to the United Kingdom, Germany, France, Italy and Spain this summer, with a "global" expansion planned to follow. There's no firm date as of yet, but they have changed the developer agreement and are already accepting submissions for apps to be distributed in the listed countries, so it can't be too far off.
This is a pretty big deal, both for customers and developers. End users get access to more content for their devices, and the folks who write the apps have a broader customer base to solicit. It's good for business, and for many, Android apps are their business.
Hopefully Amazon will start offering more of their services on both sides of the pond, and other companies (hello, Google!) can work out the issues and follow suit.