Adobe released Adobe Reader 9. Apart from significant speed improments compared to older Adobe Reader versions, its new features are related to PDF Portfolios, Native Adobe Flash support, Acrobat.com (beta) integration, Improved CAD and geospatial functionality and PDF Standards Pane. It has several Security enhancements, Accessibility enhancements and the new Adobe Reader 9 MUI, which allows you to install any combination of supported languages. Check out the what's new to compare 'Adobe Reader 9' with 'Adobe Reader 8.

Check out "Deploy Adobe Acrobat and Reader" and the new 'Adobe Customization Wizard 9' which makes it very easy to customize the Adobe Reader for deployment: