I've heard many writers rave about Google Maps, but until A Promise Kept, the book I just finished, I didn't really need it. I knew my settings well from site visits or having lived in the communities.
Cincinnati -- yeah, don't know it well at all.
So I turned to Google maps. I LOVE the satellite feature. It allowed me to explore neighborhoods and figure out exactly where my characters lived. It also allowed me to see the library branch. I strolled through Eden Park. It was amazing! I still would have preferred to actually visit the site, but this provided a second best approach.
So here's your challenge for the day -- go to google maps and see if you're house shows up. Ours doesn't (yet!), and I'm okay with that.