Sumatra PDF is a slim, free, open-source PDF viewer for Windows.
Why another PDF viewer?
There"s nothing wrong with Adobe Acrobat... except for annoyingly long startup time. Sumatra has a minimalistic design. Simplicity has a higher priority than a lot of features. It"s small and starts up very fast. It"s designed for portable use: it"s just one file with no external dependencies so you can easily run it from external USB drive.
Changelog version 0.5 (2007-03-04)
* fixed rendering problems with some PDF files
* speedups - the application should feel be snappy and there should be less waiting for rendering
* added "r" keybinding for reloading currently open PDF file
* added
* fixed a crash or two