Posted by Jeff Beard: "A few months ago, Adobe released Acrobat version 9. I've wanted to blog about this for a while now, but also really wanted to use the software before posting to provide a realistic assessment. This time around, I've had the good fortune of trying both Acrobat 9 Professional and the new Extended version. Keep in mind this is the ninth version, so it's become quite a mature package by now. While there's not a huge number of new features, there are a number of subtle refinements throughout, which is a good thing. Unlike the jarring interface change from Acrobat 7 to Acrobat 8 that made users squirm to have to relearn it (though I greatly preferred 8's interface to 7's), this time around, Adobe kept the visual changes down to a minimum. So it's much easier to get your bearings quickly with version 9. Whether you need to upgrade really comes down to this: What is new can be helpful, depending on how you typically use Acrobat.
First off, the biggest noticeable change for me is that the web site PDF capture and conversion module actually works, for the first time since they added the feature several versions ago...
For those assembling and publishing PDF binders, the newly named "Portfolio" feature is really a refinement of the binder along its evolutionary scale...
Those of us concerned with embedded metadata will be happy to hear that the metadata removal features have been enhanced as well...
For a balanced, in-depth review, I'll point you to Brett Burney's article on Law.com. Also, Rick Borstein's Acrobat for Legal Professionals blog has a great post detailing all of these changes and more. Overall, Acrobat 9 Professional and Professional Extended seem to launch more quickly and seem more refined. Bottom line, those who are only using Acrobat 8 for the most basic use may not see much reason to upgrade to 9, but those who are responsible for creating and distributing more complex and professional-looking PDFs should definitely give it a try."