Private labeled Foursquare for Digital Signage - DoubleDutch

The other day I mentioned how interesting it would be to use digital signage as as a signpost to drive users to mobile browsers and then capture your advertising revenue there - on the mobile browser - to support your digital signage implementation. You can see that post here.
Now take it a step further - use your digital signage to build a community that is location based - the digital signage promotes the community - and they all check in with a location based service to see what's happening in that community, on the mobile browser, which is once again an opportunity to use mobile advertising. Think trade shows, hotels, schools, malls...
And now you don't have to build a thing, just mash it up using DoubleDutch. Check out Scobels excellent video interview of DoubleDutch's CEO here.