Get the act together with development tools and documentation. You spend endless hours with Maemo just to get the software packaged for the first time. Android can show an example.

Do some proper research and planning to get the PIM correct. Now it seems that random developers with requirements like "make a calendar" have hacked the thing together. PIM might be more important with Nokia E-series though.

Improve the media players and indexers. Codec support is quite good already, but e.g. default music player is lacking obvious features.