This is actually turning out to be a fairly fascinating/interesting topic. Have done some preliminary Google 'research'.
Using Agents as intermediaries for business connecting:
http://www.ifaamas.org/Proceedings/aamas08/proceedings/pdf/i...
Abstract only but some juicy bits:
http://mesharpe.metapress.com/app/home/contribution.asp?refe...
"VisiVenue is an online service helping business people find, connect, and interact with one another more efficiently and effectively - using scored profile matching that gives you a "short list" automatically" http://calendars.techvenue.com/VisiVenue/
And if you're thinking blue-sky (in terms of data access) - merge the physical tracking with online tracking (where people frequent online):
