Whose ready for some AOL ultimate Frisbee?
To answer the question, I don't think they should be used for anything. Keep a small stack for a rainy day and get rid of the rest. There is a reason they are all it thrift stores and being given away for free. Their are much better alternatives out their for storage. Unless you are a hoarder. Then, just add them to your pile of crap you will never use/need again.
I have burned thousands of CD/DVDs in my life but maybe only 10 in the past 15 years or so.