Being lazy on tablets

It is a cardinal sin -- and most of us are guilty of it -- to make your apps stretch on tablets! If you go from HTC Evo to Galaxy Tab 7 it seems that you have only a small area increase between 4.3 and 7 inch screen, but indeed you leave about 60% of the screen unused! On 10 inch tablet you leave 4/5th of the screen unused, the difference could be upsetting vs outstanding user experience.

Uki's Google Java Technology blog