Labmeeting
= a social network for scientists
URL = http://www.labmeeting.com/
Description
"Scientists can recommend papers to colleagues, mark them up, create collections, and follow what other scientists are collecting. Each scientist gets a profile page. By interacting through their research, they are more likely to interact with each other. Labmeeting could also form of basis a community ranking system for scientific papers, based on who is reading, writing, and sharing them.
Labmeeting is free for individual scientists and students. Eventually, Kaganovich plans to charge subscription fees to corporate users such as drug and biotech companies." (http://www.techcrunch.com/2008/07/30/labmeeting-a-social-network-for-scientists/)