Lost CDs

Has anyone else had this problem: Over the past five years or so I have found that a number of my CDs have gone missing. It is really infuriating. I have only in the past few months really started to notice what is missing since I have been trying to get my collection into mp3. Some albums I am really annoyed at and there are a few I dont really care about. SuXOr.

Im off to run errends