There has been a great article posted over at CNet News, which discusses Microsoft's attendance at the Black Hat Briefings.
"This year, for the first time in the event's 10-year history, several sessions are focused on the security--rather than the insecurity--of a single vendor's product. Microsoft, a platinum sponsor, is giving presentations on Vista."
Vista attracted an audience bigger than many of the other sessions, and the talk was very technical oriented, rather than marketing based; something that pleased many of the attendees. Microsoft also handed out early builds of Vista and is hoping for feedback from the attendees.
According to the article, Microsoft's Black Hat presentations cover various aspects of security in the operating system update, including broad talks on fundamentals and security engineering, and specific sessions on networking technology, Wi-Fi, heap management enhancements, and Internet Explorer 7. The article also goes on to mention Microsoft's 'Blue Hat' initiative, where Microsoft invite hackers to come to the HQ and talk security.
From reading the article, I really do get the impression that many people believe that Microsoft really is heading in the right direction.