<< Google has stated that it currently isn't using Android on any tablets, hinting that it will have a tablet-centric OS soon.

Although Gingerbread and Honeycomb have been strongly tipped to be tablet-friendly versions of Android, this is the first time Google has confirmed Froyo isn't a platform for iPad rivals. >>

Source:
http://www.techradar.com/news/phone-and-communications/mobile-phones/google-android-not-optimised-for-tablets--715550

There is a story at liliputing titled "Google: Android isn't designed for tablets ... yet". http://liliputing.com/2010/09/google-android-isnt-designed-for-tablets-yet.html
It speculates why Google did not support Android tablets, why manufacturers use it, and why consumers want it.

slashdot: "Why Google Isn't Pushing Android For Tablets" http://mobile.slashdot.org/article.pl?sid=10/09/10/2337249