The success of Android (Java) and iOS (Objective-C) showed us that allowing several languages on a platform just adds unnecessary complexity. One language is sufficient to develop great applications.
I guess that would be 0.999...5
They should add support for the Motorola i1. It's (in the USA) the only pay as you go phone with android, and it runs android v1.5.
I put a Get OpenOffice button on my website. That may not be much but still too many people use m$ word just because they don't know ooffice exists. So a marketing campaign can help the same way it did for firefox.