This is a free PDF reader and note-taker application for Mac OS X. Printing everything just takes off your time, skimming is the best. And its so called Skim. And this software has not a single function, and here is the list of features available with it –

• Viewing PDFs.
• Adding and best online casino 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
• Smart cropping tools
• Extensive AppleScript support
• Bookmarks
• Saving passwords in Keychain
• Export notes as text
• Automatic download of remote PDFs
• Support for Apple Remote Control
• Interaction with LaTeX and PDFSync
• Integration with BibDesk
• Spotlight support
• Highly customizable

The minimum requirement is the Mac Tiger version, under which it won”t be able to install the application.
Download the Skim pdf reader application from here.