Have you looked at the Workout Manager calendar section? Click on a day (today or future day), then click on STS "add new" and you will see a list of every STS disc. Click on any disc and you'll see every single exercise in list form that can be easily printed. This information has been there since the new site went up, but it's kind of cumbersome to locate. Anyway, you can print out each STS workout in paper form, put it in a binder and voila, you have an STS workout log.
HTH!
I wish SNM would post a sticky about this as this has been posted numerous times, but it gets buried so not enough folks find the info. It would help a lot of people, IMO.