If you don't want to spend $74 on PDF-XChange Pro 2012, be aware that you can find most of the features it offers over and above the $45 PDF-XChange Tools 4 elsewhere for free. For example, Blueberry's PDF Form Filler will add clickable URL links to an existing PDF, can convert files from most Windows applications via the printer list, OpenOffice has interactive-form creation and "convert to PDF" functions built in, and the free version of PDF-XChange Viewer is excellent. But if you don't want the hassle of multiple programs, or if your employer expects you to use Microsoft Office, PDF-XChange Pro 2012 is a great alternative to Adobe Acrobat X Pro.