To get the most out of Adobe Acrobat Reader 9 Pro, follow these best practices:
The "Commenting" tool was a marvel of passive aggression. You could use sticky notes, text boxes, or—if you really hated your coworkers—the Audio Comment tool. Imagine receiving a 40-page engineering schematic, only to find a little speaker icon in the corner that plays your boss whispering, “This is wrong. Fix it.”
And it was a monster.