Want a guest book you'll actually look at again? Create a photo book of your engagement photos for guests to sign. This is the best alternative guest book idea I have seen. maybe to go along with a traditional guest book?
Wedding Day Emergency Kit - need to remember to get all this so I'm all ready for my maid of honor duties! Also, need to add a Mr. Clean magic eraser to this list! Best thing ever for removing stains on delicate fabric.