The iPod Touch is now the No.2 device in the AdMob Network, with a 4.7 per cent share of requests in December 2008.

Seventy per cent of iPod Touch requests during the period came from the US, though AdMob says it experienced strong growth across major markets including Canada, UK, Mexico, Germany and France.

Combined, the iPhone and iPod Touch represent 15.5 per cent of AdMob's worldwide requests.        

Other highlights from AdMob's December 2008 mobile ad metrics report:

- Smartphones increased from 22 per cent of total requests worldwide in May to 33 per cent in December.    

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- Symbian is the No.1 smartphone OS worldwide with 41 per cent share. In Asia and Africa it has more than 90 per cent share.

- The iPhone OS had 32 per cent worldwide share in December, up from 6 per cent in May.

- Worldwide, RIM has 10 per cent and Windows Mobile has 9 per cent OS share.  Both are strongest in North America and Latin America.                           

- Palm has four per cent of smartphone OS share worldwide with more than 95 per cent of its requests generated in North America. In the US, Palm had nine per cent share in December, declining from 20 per cent in July.

- Android already leads Symbian in North America with two percent of OS share.