"Microsoft have made available build v6002-16497 of Service Pack 2 for both Windows Vista and Server 2008 to testers late last night. The bits show a compile date of October 17th and weigh in on average around the 3 Gigabyte mark.

Early reports show that the build has a smaller memory footprint, you can find more discussion here on our forums, we'll update this post when more information becomes available."