You can easily synch your Zotero library into Mendeley (check preferences). Mendeley is (in my biased opinion) easier to use with a better user interface. It allows you to read, annotate, collaborate in groups, etc. Sync to the web so you can run Mendeley on multiple operating systems (and even mobile apps). While not always up-to-date, here's a large comparison table of reference management tools: http://en.wikipedia.org/wiki/Comparison_of_reference_managem...