Windows Client links that were posted on Microsoft.com from 3/6/09 - 3/12/09 that might be of interest:
Measuring Browser Performance: Understanding issues in benchmarking and performance analysis: https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=cd8932f3-b4be-4e0e-a73b-4a373d85146d
Certificate Revocation Checking in Windows Vista and Windows Server 2008: https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=361c4644-9b1b-41fd-aaf9-370717edcbbc
Microsoft Windows Dynamic Cache Service: https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=e24ade0a-5efe-43c8-b9c3-5d0ecb2f39af
Preserving OEM Activation in Windows Vista: https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=8f9753d6-0714-4940-884a-33027683e328
Transcript - Windows 7: To the Beta and Beyond: https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=96feb259-3ea9-40e4-b1a4-61d95d594b64
March 2009 Security Release ISO Image: https://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=ffc89a11-3e5f-4a1a-a183-3d340b9503d8
KB958690 (A security issue has been identified that could allow an unauthenticated remote attacker to compromise your system and gain control over it.):
KB938464 (A security issue has been identified that could allow an attacker to remotely compromise a Windows-based system that uses GDI+ and gain control over it.):
KB958655 (Install this update to resolve an issue in MSI Installer 4.5.)