The new reCAPTCHAs show the familiar warped text image on one side, with a house address, street address, or even a street sign on the other side. They're not that common yet, but they've been seen on Google's AdWords website, and it only took five refreshes of this page to get the image above.
running an experiment.
"We’re currently running an experiment in which characters from Street View images are appearing in CAPTCHAs. We often extract data such as street names and traffic signs from Street View imagery to improve Google Maps with useful information like business addresses and locations. Based on the data and results of these reCaptcha tests, we’ll determine if using imagery might also be an effective way to further refine our tools for fighting machine and bot-related abuse online."
It just goes to show that there are still some things humans are still best suited for. It's for this reason that Amazon.com's Mechanical Turk was created.