Engadget : "launches officially (really) November 30th to corporate customers, while consumers will be able to get theirs going January 30th, 2007. Stay tuned as the bugs keep a gettin' squished over Redmond way, and we count down to what will probably be the biggest software launch since XP."
Source: http://www.engadget.com/2006/11/02/vista-gets-a-date-november-30th-and-january-30th-2007/
Also rumored that the MSDN release is somewhere in the middle of November!