Zotero [zoh-TAIR-oh] is a free, easy-to-use Firefox extension to help
you collect, manage, and cite your research sources. What do U think
about this tool?
http://en.wikipedia.org/wiki/Zotero
I need a tool for taking notes in the course of reading articles. It
would be nice to have a GUI where I can link my note to the specified
paragraph, or sentence. What do you use for this?