Mendeley definitely seem to be on the ball, they have actually bothered to comment on my blog. They also seem to be very open about their future plans and about making certain aspects of their software flexible for use by the users (i.e. formatting of your own citations styles).
What I think would be a cool thing to do, is to use the information from the My Publications to automatically create peoples profiles.
In BiomedExperts, I only needed to select my publications to have a profile generated with keywords that define the organisms, concepts and ideas I work on. It also used my co-authors to create a network of collaborators and addresses from my publications to create a GeoNetwork.
My profile is bare at the moment except for My Publications. It would be nice if it could be self-generating.