Hi all, I just thought I'd let you know if it hasn't already been posted in which case if it has I apologize. Google Earth can be installed for those of us not on 2.1 and rooted. I just installed it on my stock 2.0.1 non-rooted Droid and it works well with pinch to zoom and everything. Just follow the simple steps listed in the following link and enjoy!
google earth for 2.0.1 and non-rooted users | droid life: a motorola droid blog