I am copying this question from here: 

http://www.paperbackswap.com/How-Keep-Records-Books-Read/topic/279533/?t=279533

You could create a book list. The only way I keep track is by rating them, that way if it is a reprint, I can look at previous printings and see that I have rated it.

Plus I can check the "books I've read" list here on PBS.

Jane

I keep a list of all my books on my computer. I have LibreOfficer Writer (free program) and have files of all the books that are my Keepers, where they are located (bookcases A, B, C, etc.), books that are listed on PBS and their location, my Unpostables and also books TBR and books that I have read and put back into PBS. When I go to pick books on PBS, I also check all my lists (files) to see if I have read them before or if I need them to complete series that I keep. It is time consuming, but I finally did this to keep everything organised with minimum mistakes. I forget things sometimes and this is the best for me. I also keep a list of books I sent out to PBS members.  :  )

I use www.goodreads.com.  Love it, great way to keep track and also find your next favorite book.