I also have these documents stored somewhere on the web (Google Docs, online email, Dropbox, or SugarSync) in case something were to happen to my binder.
I personally prefer a soft, floppy binder as it will fit easier into my backpack.
Here's what my binder looked like for our trip to northern Europe:
If you'd like to use a copy of our blank travel itinerary, you can make a copy of your own from Google Docs. Just click here and enjoy!