Here is a link to an online slide show, Staying Current with Science Blogs & Wikis? , created by Patricia F. Anderson of the University of Michigan Health Sciences Libraries. You can comment on the slides if you have a slideshare account. The abstract for the slide show reads:

Leading journals and voices in science are speaking informally about new directions and developments in research through blogs and podcasts. Wikis are being used for research communities to develop consensus views on best practices in research methodologies as well as developing shared resources. There are some excellent examples available of how these are being used to increase communication, community, and productivity in science, research, and clinical communities.