Here are some mobile apps that allow interaction with the physical world in interesting ways:
1. ScanR – Allows you to scan a document or whiteboard using a cell phone or digital camera and convert that into a pdf doc that gets emailed to you. Alternatively you can fax this as well.
2. nThrum – Focus your camera cell phone onto any text in the physical world(say a book or newspaper or billboard) and search on the web.
3. Geovector – Users can point their mobile phones at restaurants and get reviews, point at billboards and go directly to the advertiser’s mobile site for shopping, point at a movie poster and buy a ticket, play a game by pointing at their friends !! . They have a nice caption :”Click on the real world”.