I have been through all the apps mentioned here and settled on Sente (www.thirdstreetsoftware.com). Very powerful, does all the biblio/citation thing if you nee

I have been through all the apps mentioned here and settled on Sente (www.thirdstreetsoftware.com). Very powerful, does all the biblio/citation thing if you need it, as well as the visualization part that Papers does. It is not as polished as specific tools (such as a Papers/Endnote combo), but I find it nice to store all my pdfs in one place, automatically adding meta data through Google Scholar, Pubmed or whatever, and commenting/highlighting in the same application. There are also some very good applescripts to export notes to Devonthink and implement a citation database à la Steven Johnson (http://www.stevenberlinjohnson.com/movabletype/archives/000230.html http://www.stevenberlinjohnson.com/movabletype/archives/0002...). My main library also sits in Dropbox, and is always accessible even when I am not at a Mac.