A new cool application was released by Google this week as part of the Apps for Android project. This application is called Photostream and lets you browse the photos collection of any Flickr user. The official Android blog has more details about the application.
The source code is available on the Subversion repository and is licensed under the Apache 2.0 License. The repository contains the source code of equally cool applications like Globaltime (the Earth in 3D), Translate or WikiNotes.
If you want to know what it looks like without downloading and installing it yourself, you can take a look at a video of the application in action. The video shows the application running on the emulator from the recent Android SDK 0.9.