I've just been looking for a pdf annotation tool (prompted by my wife who was printing out copious pdfs so that she could write in the margin of them).
There has to be an easier way I thought.
If anyone knows of a better tool please let me know but this one seems pretty cool.
It allows you to type, highlight, add notes, draw etc onto a pdf file. The free version adds a software evaluation message to the top of each page which you would have to just ignore. If you pay for the pro version the message goes away. I'm amazed I haven't wanted to do this before now! Cool!