10 of the biggest announcements from Google I/O history

Google is having its annual I/O developers' conference on June 25 and June 26 in San Francisco. As we wait to hear what's in store this year, here is a look back at some of what Google has done in years past.
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Google I/O turns seven this year and has created a lot of waves over the years. From the introduction of Android to Google Wave to Google+, here is a look back at the big announcements from each of Google's I/O developers conferences and where they stand now.

Some are huge hits and are still going strong, some have burned out and some, well, we don't know exactly where some of them stand. This is by no means a comprehensive list of everything Google has introduced at these conferences -- but here are 10 we find interesting. 

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