How to check in to location based services using QR codes. Introducing http://xmts.mobi/ Talk given at BarCamp Brighton 5 http://lanyrd.com/2010/barcamp-brighton/sgdc Audio of presentation: http://audioboo.fm/boos/192609-location-based-qr-codes-introducing-http-xmts-mobi Audio of discussion: http://audioboo.fm/boos/192617-discussion-introducing-http-xmts-mobi