In the dev.leapmotion forum, user jaxzin presented his work on a his google maps leap project lately. You can grab the map and zoom and pan around. Test it in your browser.
jaxzin: Here’s my first dabble into the Leap Motion API, a Google Map that you can grab and pan with one hand or zoom by grabbing it with two hands. It’s been fun hacking on the leap.js library. I’ve tested it in Chrome and Safari and it appears to work well. On my todo list is to reduce the jitter and improve my hacky grab gesture recognition. I’m looking forward to pinch gesture support someday, that would be a more natural gesture for this.