Ryan Cordell has recently rounded up various systems for managing and annotating PDFs. (See his original post, and the follow-up.) Those posts focused mostly on assimilating PDFs into your research, ...

One of the easiest ways to read articles offline is to save them as a PDF, and thanks to a handy feature provided by Apple, it's effortless to do on your iPhone and iPad. Saving a webpage as a PDF ...

iOS comes with a fast and elegant built-in PDF viewer (in fact, the latest JailbreakMe 3.0 is largely based upon a security hole in the PDF display engine), but unlike Mac OS X the options to convert ...

UPDF has always been a fantastic PDF editor for iPhone, iPad, and Mac. PDF features like annotation, editing, converting, optical character recognition (OCR), protecting, filling, and signing are easy ...