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 0.6 (2007-04-29)
* enable opening password-protected PDFs
* don"t allow printing in PDFs that have printing forbidden
* don"t automatically reopen files at startup
* new, better icon
* reload the document when changing rendering engine
* improve cursor shown when dragging
* fix toolbar appearance on XP and Vista with classic theme
* when MuPDF engine cannot load a file or render a page, we fallback to poppler engine to make rendering more robust
* fixed a few crashes