The OCLC Members Council has a Digital Library Research Interest Group that we in OCLC Research meet with three times a year. I gave a short talk about our plans for a WorldCat Wiki, a new project involving several groups here at OCLC.
The idea is to have a Wiki that complements WorldCat. People could add reviews, cover art, comments, etc. and relate these to bibliographic records (maybe at the FRBR work-level too). We hope the system is flexible enough so that people do (good) things we're not expecting. We'd like the Wiki to be available anywhere WorldCat records are.
The DLR interest group had some good suggestions about how this sort of capability might fit into their local situations. Some of the ideas might take a little more structure in terms of group membership than we had been planning. There certainly is a lot of effort being expended within and with libraries that isn't being shared very well and this might help with that.
I've mentioned the MetaWiki software we're using to build the Wiki part of this.