High on the agenda at IO was Android, Google's open source software platform being designed for smart phones.
A demo at the conference revealed some new applications for its Android mobile operating system.
These include a way to unlock phones by drawing a specific shape on the touch screen, a compass tool that automatically orientates maps when a user looks at photographic images of a city, a magnifying tool to zoom in on web content and a mobile version of the video game Pac Man.
The Android touchscreen is reminiscent of the iPhone
The phone being used at the conference relied on fingertip touch but Andy Rubin, who is overseeing the project, said Android could also be tailored to work with a tracking ball.
The first phones powered by Android are due out in the second half of this year.
With about three billion mobile phones already on the market, some analysts believe Google could make about $5 billion annually within five years.
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