The Android platform is a software stack for mobile devices including an operating system, middleware and key applications. Developers can create applications for the platform using the Android SDK. Applications are written using the Java programming language and run on Dalvik, a custom virtual machine designed for embedded use which runs on top of a Linux kernel.
An early look at the Android SDK is also available. It includes sample projects with source code, development tools, an emulator, and of course all the libraries you’ll need to build an Android application.