I'm seeing it on Google Maps 5.7.0, though it only seems to actually work reliably if you're also signed into Google Latitude. For what it's worth, I see a "Che

I'm seeing it on Google Maps 5.7.0, though it only seems to actually work reliably if you're also signed into Google Latitude. For what it's worth, I see a "Check In" option right next to "Rate and Review" when I go to My Location -> What's Nearby -> [Place].