Having a brain fart, need help airing it out So, what's the name of that thing that goes in large binders that helps you keep papers from getting wrinkled? →[More:]

One goes in the front, the other in the back, and if I had the time to try uploading a pic to Flickr to embed and show you what I mean, I would. The best I can do it point you here, point at the thing inside the binder and shriek, "That thing! What do you call it? Can I order some by themselves?!"

Alternately, if there's something rudimentary you forgot the name of or some easy process you always forget how to do, please feel free to share.