Iphone app NARB is people filtered art.
You can: discover art in your home town or the city you’re visiting, rate art where you find it, leave your comments, discuss with other users, use your camera to add art pieces, share your discoveries and build your online art collection.
Was very helpfull while visiting the art festival: museumnight in Rotterdam where it gave interactive service during the evening festivities. My favourite that evening: Pippilotti Rist at museum Boijmans van Beuningen.