Fascinating stuff, I know.
Also, in my neighborhood, the front yards all have a "community" feel. They flow into each other, so putting up some property divider seemed unneighborly...
Long story short, I've decided to put a 5 foot panel of 4 foot tall picket fence on either side and halfway down the driveway to separate the "driveway" from the "front yard." This creates a visual barrier and a feeling of being in the community, and then entering onto our property. Equally, the pretty, little fence has a "go away" and "welcome" aspect that I like.
I still need to pull some dead ornamental grass out of the driveway landscaping and rake the pine needles up before the next phase (adding ground cover), but instead, I woke up to a winter wonderland on Saturday.