How to check professional relations of scientists?

It would be nice to have a place to go and check all the professional relations of scientists. Who's working on what project? Who knows who? What are the inter- and intra-institutional relations? How can we contact others? What languages are people working in? Where are their publications and who's reading them?

Jigsaw is a place to build up buisiness contacts and relations, it could serve as a model of how to build up contacts in the science world.

Directory of Business Contacts and Company Information from Jigsaw