[Zope] Anyone built a classifieds or review product?

On my list of products that I would like to build / help build ZCLassifieds: A product that allows users to post classifieds for sale with categories, pictures, start and end dates, email contacts, etc. Could be anonymous or require a log in that plays upon the strengths of Zope. ZReview: A generic review product that allows people to post reviews of "things" and have other people comment on the review. A lot of what is in Zope Treasures but maybe with pictures etc. Has anyone starting building these, need these, or would be interested in helping build these? J