YIID stands for "your internet id"and it's an identity hub combined with social search, realised through Marco Ripanti. More specifically it is an aggregator for identities and social activities. YIID seems to be a combination of friendfeed and 123people. You can set up your own profile page, displaying all your different web-identities and the content you produce at typical web2.0-sites. Marco believes in the open web, supporting open standards like openID. That way you can bring in all your content, but also take them out again.
Marco is looking for partners who generate any kind of user generated content, pushing it in a new dimension and through that generating more attention and user.
YIID emerged out of the former project communipedia, which was supposed to be some sort of meta-community or community search engine. Behind YIID stands Marcos company ekaabo, which develops special interest communities.
The interview was taken at the SUN Ctartup Camp in Cologne, more interviews of that event you can find here.