Millennial Media has released the numbers from August’s Mobile Mix report, noting a 7% increase of Android OS shares for the U.S. mobile market.  That keeps Android in the number 2 spot, though making significant gains towards Apple, which has 29% of the entire market share for Millennial Media’s mobile ad network—just 3% higher than Android’s total share.

Android’s continued success is interesting, but the swelling pool of smartphone devices on the market is generating some interesting data beyond OS market share.  Millennial Media is drilling down deeper into mobile advertising analytics, as well as device-specific specs and interests around certain kinds of mobile apps across the varied devices.

For instance, August’s Mobile Mix report has a special feature spotlighting BlackBerry, looking at the multiple devices RIM has launched in the past year.  Corresponding with BlackBerry DEVCON in August, the Mobile Mix report’s BlackBerry Snapshot demonstrates the smartphone’s activity in the space.

Some of the more notable stats include a 45% female market share, with 53% of total BlackBerry users having earned a college degree.  The BlackBerry has also seen a 40% increase in the average number of apps per user since December 2009, boasting over 11 million device sales in the last quarter alone.

As big as BlackBerry’s strides were for the year, Android is still dominating the scene, seeing an increase in ad requests at a rate of 39%, month-over-month.  Since January, Android ad requests have grown 996%.

Many device manufacturers are to thank for Android’s success, including Motorola.  The company has succeeded in becoming an Android leader, taking the number 2 position on the Top 20 Mobile Phones list, with its Droid device gaining over 9% of ad impressions on Millennial Media’s network.

Now that the iPad has been on the market for several months, more metrics around tablet devices are emerging as well.  The Apple iPad has seen a 76% increase in ad requests, month-over-month, indicating interests in this market continue to flourish.

Going even deeper, Millennial Media looked at touch screen and keypad use, noting an 11% decline for the keypads, and a 10% increase for touch screen use (month-over-month).  These kinds of stats are important to consider, but for advertising in particular, you need to know where consumer fingers are happiest on mobile devices.