Google has just announced that it has acquired AdMob, the mobile advertising company, for $750 million.

Sequoia Capital, Accel Partners, DFJ and Northgate Capital will see a huge upside from this investment.

AdMob founder Omar Hamoui sent the following letter to customers:

Today we announced that AdMob has signed a definitive agreement to be acquired by Google for $750 million. We are extremely excited about this new partnership and what it means for our advertiser, developer and publisher partners.

AdMob’s people, products and tools will continue to work to deliver successful campaigns for you and to effectively monetize your mobile traffic – no interruptions. Our product and engineering teams will keep building great products for our customers. Our sales team will keep working with our thousands of advertisers to deliver successful campaigns. Our business development team will keep working to maximize ad revenue for the more than 15,000 mobile Web sites and applications that make up AdMob’s publisher network.

After our deal closes, AdMob will work with Google to accelerate the pace of innovation in mobile and do an even better job for you. We believe this deal will benefit our advertisers, developers and publishers by:

• Increasing our investment in building innovative and engaging ad units across platforms and to further improve targeting and tracking.
• Building even more powerful relevance and optimization capabilities, and more powerful technology and tools to monetize mobile traffic.
• Increasing the effectiveness of display advertising on mobile devices by leveraging Google sales team, infrastructure and relationships.
• Improving the already high level of service and support we deliver to our advertisers, developers and publishers.

Google has written its own blog post announcing the Admob deal:

iPhone and Android users browse the Internet more often than anyone else [Morgan Stanley], contributing to Google’s 5x mobile search growth over the past two years..

And a quarter of these same iPhone and Android users spend nearly 90 minutes per day using applications on their devices [AdMob]

Google has also shown in its press section,  what it has currently vis-a-vis where admob is popular today:

Google -Admob

As Google points out, the deal follows similar acquisitions by traditional online companies looking to move into mobile:  AOL bought Third Screen Media more than two years ago, Yahoo picked up Actionality and Microsoft bought ScreenTonic.