I just read about a service called TWISNEY. Basically it is a service that broadcasts photos, and live updates sent in from visitors, and employees. TWISNEY uses the Twitter service, and E-Mail service to achieve its goal.
Most people with current phones have the capability to use the site. You can view the lists of updates, or photos.
Go to http://twisney.com/mobile from your mobile phone, and take a look for yourself.