Adobe just released version 8 of their Reader software, once called Acrobat Reader. You can download it here. Now available on 23 platforms in 26 languages, over 500 million copies of Adobe Reader have been downloaded since it’s initial release. Among the ‘reasons to upgrade’ to this version are:

Launch an online, real-time meeting in seconds
Instantly collaborate with virtually anyone, anywhere, at any time. Use the Start Meeting button in Reader 8 to access Adobe Acrobat® Connect™ software and deliver online training and support or communicate with remote audiences in real time. Accelerate approvals with new Reader 8 features that include shared document reviews, a streamlined review tracker, and a simple RSS reader.

Use improved accessibility features
Reader 8 helps you meet the accessibility requirements mandated by Section 508 of the amended U.S. Rehabilitation Act. Try the improved read out loud capabilities in Reader 8 or change the reading order of pages or columns after PDF files are tagged to accommodate preferences.

Adobe says they have tested it with a beta version of Vista, and an update will be available if required for the shipping version of Vista.