After December 2006, the law will prohibit companies from printing the expiration date or more than the last five digits of a credit or debit card on a hard copy receipt.

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Not only should you keep the receipt, but also copy the front and back of the gift card.

FORBES: More Holiday Shopping Tips

Travelocity and the FAA recommended printing out a copy of the reservation receipt, which could be an e-mail message, although it was unclear what would constitute a valid receipt.

CNN: FAA imposes restrictions on e-tickets

Not an in store copy but the original receipt.

ENGADGET: HDTV Buying Guide: Extended Warranties HD

You can plug in the actual cost for an item, if you have a receipt (or can get a copy of one from the previous owner), or pick among price ranges the software generates based on national market surveys.

FORBES: Depreciate It

Instead, they should copy successful social democratic parties in places like Sweden and Denmark, and reform welfare systems to link receipt of benefits to paying taxes, and cracking down on benefit fraud.

ECONOMIST: European politics