An update to Acrobat 8, upgrading Acrobat 8 to Acrobat 8.1 (Professional & Standard) is available via Adobe Updater (in Acrobat). A download on Adobe.com will be available later this month (I'll update you when it is live)
The 8.1 release works with Microsoft Office 2007 and Microsoft Vista. Both PDF as a file format and Acrobat as an application are now "first class" citizens in these environments.
Adobe, Acrobat, Acrobat 8.1, Software, Downloads