PDF is a great format, but sometimes not being able add to one can be a real pain. Reading an article without a highlight pen can be frustrating to me and I confess I used to waste paper by printing document just so I could get highlight pen out. Not anymore!
The free version of PDF-Xchange viewer has unleashed my creative abilities and I can mark up PDF’s to my hearts content.
Another useful PDF extension is the ability to publish PDF’s in a handy viewable manner via
Youblisher.com Just sign up for a free account and have your document presented in a nice page turning format. Here is an example