I found this site while googling "online reference management software". It's a blog with lots of interesting articles, for those who are interested in such things.
Apart from periodic reviews on reference managers, other articles I liked were:
Stop Powerpointing and Start Outlining in which the author points out the disadvantages of using powerpoint to plan your talk, and suggests n alternative method,
and a discussion of a post from Luis Ahn discussing the difference between research and publishing papers.
Bilateral hilar lymphadenopathy with and Right paratracheal strip enlargement Bilateral infiltrates involving predominantly the mid zones, possibly indicat...