Google's Android platform was long ago promised as an open-source one that anyone could customize, play with or just stare at if they wish. While the actual release of the code was significantly delayed, Google has finally delivered on what they claimed and made the Android source available to all.
The code is available as part of Google's new Android open source project, which not only offers the code Google has built already but encourages developers to build applications based around the platform. On top of the code, Google is providing several APIs for development. From this move we could easily see Android being pushed far beyond the handsets Google officially endorses. It'll be interesting to see how the world reacts to this code being made available.