Intuit is offering their Quickbooks Cash Register Plus Software for free instantly via download. This is the 2009 version, which is selling for $239 on Amazon. As the name suggests, this software turns your laptop into a cash register, accepts credit card payments, and syncs with Quickbooks very easily. No hardware is included. (Expired)
I decided to take one just in case. You just checkout for $0 and you receive a license key and a download link. No credit card required. It says the offer expired 12/15/08 but everything appears to still work. Via SD.
Not a business? Don’t forget that you can also get personal finance management software Quicken Online for free as well to track your household expenses.