Android 2.2 Froyo officially announced

No huge surprises here, but Google just announced Android 2.2 "Froyo" at I/O, and the big addition is a just-in-time compiler, which brings a 2-5x speed boost to the system. There are also 20 new enterprise features, including better Exchange integration and device administration APIs, as well as a new device backup app that'll let you transfer personal data to a new device. Android 2.2 also features a new cloud-to-device messaging API that Google called "much more than a push notification service designed to make up for a lack of basic features like multitasking," and of course, WiFi tethering -- which was used to get a WiFi iPad online during the demo to great cheers. Google also demoed a new JavaScript engine in the Android browser, which is billed as "the world's fastest web browser," and a Chrome browser plugin that allows you to send directions from Maps on your desktop directly to your phone.

It's all going on live right now, so make sure to go hit our I/O liveblog!