Why Google Choosing Arduino Matters
ptorrone writes "Earlier this week at Google I/O, Google announced the Android Open Accessory kit which uses the open source hardware platform, Arduino. MAKE magazine has an in-depth article about why Google choosing the Arduino matters, why Google picked Arduino and some predictions about what's next for Apple's 'Made for iPod' as well and what Microsoft/Nokia/Skype should do to keep up."
It already existed (an android-arduino "interface"). It only matters because google is behind it now (with an official API), but whoever wanted to do stuff before already could.
Keep in mind that the *any* device that supports USB Host mode can be an Accessory. There's a full open source reference implementation for Arduino, but the protocols are documented and open and you can implement it on any hardware you like.
Docs and Specs: http://accessories.android.com/
Google IO Talk: http://www.youtube.com/watch?v=s7szcpXf2rE