Music/software archives, movie backups. Helps keep the originals nice and pristine.
Blank DVD stash...used to be lots, now working through the ones I have rather than buying more, so stash is getting smaller bit by bit (recovering media addict :p).
Blanks are kept in their original spindles/jewel cases til needed, out of the way in my closet. Burned ones kept in an aluminium DJ-style case or in wallets in boxes.
What about yourself then, since you asked...?