I love a good deal, and the best ones usually come with expiration dates in hopes that you forget about them before being able to cash in. I haven't had this problem since I started using RTM to keep track of the discounts I have yet to use and when they expire.

I have a list which I call "Deals" and whenever I come across one I like, I add the name of the shop and the expiration date. Using RTM this way, I've yet to miss out on a deal!