How many post are there in your blog? Do you browse back and read what you have posted sometimes back. And did your visitor too read what you have posted last year? Definitely the answer is 'I don't know'. So your old posts is in the cyber rubbish dump?
Recently I stumble upon a website that link your post to other (might be) related stories that visitors and maybe you yourself like to read again. At least once in a while your old posting might help you create new posting.
Just browse through my blog and you will see what I mean.