Adobe Acrobat Reader

• Read and print PDF files on your desktop or on the Web.
• From Adobe Systems:

  Adobe Reader allows more securely view, print, search, sign, verify, and collaborate on PDF documents, online as well as offline, from your home or office. Reader has a completely redesigned interface, new tools, and new options for viewing information more efficiently. Access to an online, real-time meeting in seconds.

• Screenshots from Softpedia
• More details from Softpedia
  
• Screenshots from Download.com
• License: Freeware
• OS: Windows 2000/XP/Vista
• Download page
• Homepage