Google has started rolling out its Android 2.2 (Froyo) operating system on the Google Nexus One.

Currently, it seems only certain batches of the mobile have received the update over the air, but over the next few days / weeks it’s expected that every Google Nexus One will be updated to Android 2.2.

Users can manually download the update, but we recommend waiting because it could be that Google are ensuring compatibility with each batch before releasing the update.

Android 2.2 brings vast speed improvements to both internet browsing and general usage.  It’s thought it can be up to 5 times faster than Android 2.1 with CPU heavy processes. It also enables the memory to be managed more efficiently improving performance, as well as reliability.

New features of Android 2.2 include a new tips widget for the home-screen to assist you in personalising your home-screens. Security is also improved, with the option to use alpha-numeric passwords to unlock your mobile.

It also enables the video camera to take advantage of the LED flash so you can shoot night time videos.

Another impressive improvement is the ability to turn your Google Nexus One into a portable Wi-Fi hotspot. This enables you to share your internet connection with other devices!

Finally, it adds multiple keyboard languages that can easily be changed with a swipe of the space bar. This is especially useful for those frequently speak in two different languages.