For Baen and Amazon gift certificate codes from Swagbucks, I use a method like library addict's, but I keep all the codes on the list instead of deleting them. I just switch to strikeout text for the code, and type a big USED right after I'm done with it, sometimes with a note about what account it got applied to. The latest codes get added to the top of the list.
It's a lazy, but easy way to keep track and about as complicated as I can handle.
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