Acrobat 9 is now available, ending Acrobat 8's short reign at the top of the Adobe heap. Acrobat 9 is, as just about anything these days, geared towards online work & collaboration. It also includes this, interestingly enough:

"For the first time, Acrobat 9 provides deep support for Adobe Flash technology, enabling users to include Adobe Flash Player compatible video and application files in PDF documents. Recipients simply need free Adobe Reader 9 software to consume the content."