Adobe's Acrobat Reader is a free 					plug-in which lets you view and print 				Portable Document Format (PDF) 					files. One of the best things about 					the format is that it is readable on a 				number of different platforms, 					unlike several of the alternatives. 					The PDF file format is extremely flexible, as you'll find if you view a number of the PDF files available online. Many software companies now distribute their manuals as PDF files, and .net recently gave away duplicates of their snazzy backing cards on the CD in PDF format.