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I think people use the magnets... They stick them to the fridge and are a constent reminder to keep you wedding date open. Will they safe it for LIFE, doubt it...but who cares, as long as it surved its purpose till your wedding. As far a poem goes, it is nice and cute idea...but that I see getting thrown in the garbage a lot sooner than the magnet. This is just my thoughts; personally as a guest I would prefer the magnet.
I did the magnets and everyone raved about them and definitely used them - I figured that if I spent the extra $$ on the STDs, I wanted something that someone would use.