Download This! - Foxit PDF Reader

Why install a 100MB program that consumes tons of memory, has resident services running, and leaves tracks behind - just to read a PDF file, when you can use a 1.3Mb executable that requires no installation and comes up immediately?
Foxit PDF Reader does (almost) everything Adobe Acrobat Reader does. It supports internal scripts and embedded objects. It can be downloaded as a single executable - allowing you to run it of a USB Flash Drive. (I carry it with me and occasionally, when I need to print my boarding pass on a hotel computer that never heard of the PDF extension before, it allows me to browse and print the document).

Download it here. Get the ZIP format for the standalone app, or the EXE for an installed application.