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Numberkey Transforms iPhone Into Sweet Wireless Numberpad [IPhone Apps]
Gadgetizer.com found this 11/18/2008 on gizmodo.com
The best ideas really are the simplest ones. I don't want to carry around a 17-inch notebook (does anyone?) and I'm not an accountant, but sometimes I miss the numberpad, like when I'm dropping in a credit card number or doing a stupid Excel spreadsheet, and using two hands to pound digits is ...