Free PDF markup tool
Posted by onlydarksets on September 22, 2008
I had to markup a file I had in PDF-only format, and a quick search turned up an incredibly powerful and FREE (even for commercial use) tool called PDF-XChange Viewer. In addition to being a lightweight (4MB) and fast PDF viewer (with a portable version and with IE and FF plugins), it also provides markup tools like highlighting, text boxes, comments, and drawing.
For Windows, of course.