Need help with a large vinyl collection.

I've been given a large collection of vinyl (Not sure how many, probably several hundred). I've been planning on cataloging it and selling it off to whoever is interested. Can anyone point me in the right direction for listing this stuff/where I can go to get an idea of what it is all worth.

Update: Cataloging everything here if you are interested: http://www.discogs.com/collection?user=troydhx