Dear Lifehacker, As a researcher, I have to read endless reports and papers (Word and PDF). I don’t like to read long reports on the screen, and I also tend to annotate questions/comments as I read, either at work or during a commute (where I don’t have a laptop with me). At work with Windows, it is easy to read/comment word documents, and PDF-Xchange viewer does an OK (but not great) job at letting me annotate/comment PDF articles. But both become a pain at home where I have Linux and have to rely on Wine to run Office and so on.
Web application Picfont adds text to uploaded images, so you can quickly annotate an image from any computer—or just make fun pictures to share.