Check out Connotea.This site provides the ability to create your own tags, bookmarks and more related to research. It also provides the detailed citation information and allows you to see what others have found that may be related to your area of research.
The front page looks strange at first glance but what it is actually providing is a look at what other Connotea users are currently reading about. The size and colorization indicates recent usage and how frequently a tag is used.
Along with the services it provides, it incorporates brief (2 minutes or so) tutorials targeted at specific areas or needs. Take a look and see what you think.
The site is provided by the Nature Publishing Group (http://www.nature.com/index.html)