Windows Troubleshooting: Slow Boot, Slow Logon
There are more recent articles covering slow boot and slow logon:
http://social.technet.microsoft.com/wiki/contents/articles/10123.troubleshooting-slow-operating-system-boot-times-and-slow-user-logons.aspx
http://social.technet.microsoft.com/wiki/contents/articles/10130.root-causes-for-slow-boots-and-logons.aspx
http://social.technet.microsoft.com/wiki/contents/articles/10128.tools-for-troubleshooting-slow-boots-and-slow-logons.aspx
http://social.technet.microsoft.com/wiki/contents/articles/11341.the-windows-7-boot-process-sbsl.aspx