iPhone app helps the blind ID currency
From: The Unofficial Apple Weblog
By: Chris Ward

Identifying different denominations of dollar bills has long been a problem
for the sight-impaired in the US. A US$1 bill is the same size and shape as a
$100 bill, making them hard to differentiate. 

Read the entire article at:
http://www.tuaw.com/2011/03/10/iphone-app-helps-the-blind-id-currency/

Links:
LookTel
http://www.looktel.com/

Money Reader (with video)
http://www.looktel.com/products#products-money-reader

Money Reader app on iTunes - $1.99
http://itunes.apple.com/us/app/looktel-money-reader/id417476558?mt=8