Foxit Reader is a free and light-weight PDF document viewer for Windows. Its core function is compatible with PDF Standard 1.7.
Notable features include:
Annotation tool: draw graphics, highlight text, type text and make notes on a PDF document and then print out or save the annotated document.
Text converter: You may convert the whole PDF document into a simple text file.
Small: With 9.75 MB on the harddisk it needs just a fraction of Acrobat Reader or PDF-XChange Viewer (39MB).
Fast: When you run Foxit Reader, it launches instantly without any delay, and does not display any splash screen.
Available also as portable app: http://portableapps.com/apps
