Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF, but is also great for viewing any PDF file.
Stop printing and start skimming.
* Viewing PDFs
* Adding and editing notes
* Highlighting important text
* Making "snapshots" for easy reference
* Navigation using table of contents or thumbnails
* View all your notes and highlights
* Convenient reading in full screen
* Giving powerful presentations
* Handy preview of internal links
* Focus using a reading bar
* Magnification tool
* Extensive AppleScript support
* Support for Apple Remote Control
* Interaction with LaTeX and PDFSync
* Spotlight support
* Highly customizable
* And much more...
Operating System Support: Mac OS X 10.5 Intel, Mac OS X 10.5 PPC