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I actually have two cases (like http://www.amazon.com/Vanguard-Di-H..._2?ie=UTF8&s=automotive&qid=1242583205&sr=8-2 or http://www.amazon.com/HAKUBA-USA-DM...1?ie=UTF8&s=electronics&qid=1242583284&sr=8-1) in each camera bag, one marked "USED" and one marked "AVAILABLE". After a card is taken from the AVAILABLE case and used, it's put in the USED case, write-protected and marked with a post-it flag. Whatever anyone thinks may have happened, it's forbidden to erase a card from the USED case in the field!
I have this one in a dark gray color (almost black) http://www.amazon.com/Gepe-CardSafe-Extreme-Case-memory/dp/B0002I71LG
No sharpie, erasable marker pen.