Tim and Simon from send|recieve presented a verly early alpha version of Mnemomap one week ago on the Webmontag event in Cologne (which happened to be the first one in Cologne I couldn’t attend). I am sure they’d love anyone to try Mnemomap and drop some feedback about it.
The About page states:
mnemomap is a new way to search the internet. It combines technologies of social networking, search engines and other data sources to help you formulate search queries and find really relevant information.