I went to the teacher's store a few days ago and had in mind some sort of plastic thing to hang on the wall and hold a few flash cards at a time. I found this double-sided table-top version instead (about $20) and we love it! We always have a lot of flash cards around, but don't always make good use of them. So far we've been using it for a crazy mixture of various age levels and subject matters. Just on the first day, Ria's two biology words on a flash card came up in Gus's science book. What fun!
By the way, it also folds up to put on a shelf - with the cards still in place. This is nice to keep Frank out of trouble.