Adobe Acrobat Professional 9

From Adobe Systems:

With Adobe Acrobat 9 Pro, your documents never need to slow down. Using Acrobat, you can help secure important work with passwords and send them through e-mail. Create interactive forms that are simple for virtually anyone to fill out. And easily share your documents for review, collaboration, and feedback. Make the move. Get a free 30-day trial of Acrobat 9 Pro.

With version 9, you now can synchronize document views to enable collaboration on a PDF file; protect PDF documents with 256-bit encryption; combine documents, drawings, e-mail, and spreadsheets in a single compressed PDF Portfolio, or even insert video in PDF files