I would really like to be able to catalogue my library according to edition/printing for each book at some point and know what everything is worth. Is there a sense that this will ever develop into the astounding resource that discogs is? People don't really seem to be using this as much. Honestly, it might be quicker for AbeBooks to add a library collection cataloguing feature or something. Oh well, a man can dream.
There was a marketplace (beta) but it was closed in December: