Just wondering what programs/apps people use for organizing their papers and research. Currently I use the Papers App and I love it. It allows you to highlight your PDFs, make notes, assign keywords etc. In addition, you it allows you to cite/create a bibliography into whatever word processor you use. Only downside is that is costs money. Evernote and Dropbox are good for backing up files.
Any other great apps/programs that people have come across and would like to share?