GigaOM has the scoop at: http://gigaom.com/2012/01/29/walkbase-showcases-indoor-location-tech-with-auto-check-in-app/
You can see a few screenshots, read a more detailed description and get a download link at http://checkedapp.com/
You can see a few screenshots, read a more detailed description and get a download link at http://checkedapp.com/