Look at what Apple is doing with Safari: whenever you update QuickTime or iTunes it tries to slip in an install of Safari. Google could build market share by doing the same thing with Google Earth, Google Desktop, and/or some new killer app.

Google already has deals with manufacturers like Dell and Lenovo (I think) to install its desktop search software and Google Toolbar on their computers. It won't be too hard for them to include Chrome in this bundle as well.