This blog post on Lifehacker.com explains that you can use your iPhone to carry all those reward, membership, credit, etc. cards, you can scan them to the computer then sync them to the iPhone in an album. Evidently they still can be scanned . That's a good weekend project.
[of course, make sure you have your iPhone Password Locked [set the PIN in Settings. And, maybe you'd want to limit this to miscellaneous reward and membership cards and not your financial cards, but that would save about 1/2 inch no doubt]