In September, OCLC will be trying out a Wiki component to their WorldCat database. This is based on their WikiD project that they have been working on for a while.
Those of us familiar with Amazon know the depth that user reviews can add to the standard information available when one is considering purchasing a book; I would expect that similar information within WorldCat will be extremely helpful from a research perspective, as well. This could make WorldCat a better first step for book searches than most library catalogs.
Something to watch…
(note: I somehow glazed over this entry… it was already October, and I somehow registered November as the starting month for the WikiD component. They are already accepting user reviews. It is still something to watch, however!)