Google Maps has launched today a new feature called Mapplets (Map + Applets ^^), which makes you able to insert layers with many different information into your maps, like crime rates, building prices, transit maps, area calculator(thats a nice one), and much more.
Mapplets are now available at the “My Maps” tab, where you click in “Add content” to see them all. After adding some “Mapplets”, you’ll see them placed on the left menu interface. I’ve places on this post a Mapplets demonstration made from Google. Enjoy! 🙂