Microsoft does a different kind of Google Base with Listas. From the technology preview, i.e. beta, release notes:
Listas is a tool for the creation, management and sharing of lists, notes, favorites, and more. It allows you to quickly and easily edit lists, share them with others for reading or wiki-style editing, and discover the public lists of other users. We encourage you to try using it for meeting notes, bookmarks, shopping lists, to plan a night out, or whatever other creative ways you can think of.
In the Listas Community Section, you will find a number of highlights of the most popular and random items from around the community of public lists such as ...