I am an immunologist by profession;
The below link describes an option at PubMed.gov to download academic papers as epub files. I was able to open the files in Marvin reader app on my iPad.
I assume I could import these epubs into Calibre and use Calibre to manage these papers. Has anyone else tried this use of Calibre?
http://www.ncbi.nlm.nih.gov/pmc/about/pubreader/