I have been using Connotea for a couple of weeks now to keep track of the papers I like. I am pretty happy about the service. It recognizes a significant number of journal formats (meaning it automatically grabs the title, authors’ names, etc from the web pages for you). I also like the fact that it lets me add my own comments to the papers. There is however room for improvement : it is not as well integrated to Firefox as Del.icio.us (which I use to keep track of my bookmark), it does not recognize some important journals (Cell, ScienceDirect among others). Also, it doesn’t have enough users to be useful as a discovery tool.
Link: my Connotea library.
Update 07/02/07: there is a way to make Connotea recognize articles from ScienceDirect (or from any article that has a DOI): select the DOI (e.g. doi:10.1016/S1535-6108(03)00132-6) using the mouse, than click on “Add to Connotea”.
