With the release of Acrobat 9, Adobe's focus is all about re-inventing collaboration to enhance efficiency and performance. Some features such as forms have been somewhat improved, others, such as preflight, have been considerably enhanced. Yet if there is one signature feature of this release, it is live collaboration with free web services on Acrobat.com. This review by Filipe Pereira Martins and Anna Kobylinska provides an in-depth look at the new version of Adobe's flagship PDF product.