That billboard over there...I swear it's following me

Old news for some, odd news for others. Billboards in Manhattan can now gather data on who views them by using a hidden camera. Data gathered is then used to 'tailor' the billboard to the viewer based on estimated age and gender.

Ah the wonders of facial recognition software.

http://www.nytimes.com/2008/05/31/business/media/31billboard.html?_r=1&ref=opinion&oref=slogin