A good starting point overall for the DST changes is
here.
Windows Server
KB 931836 - February 2007 cumulative time zone update for Microsoft Windows operating systems
KB 914387 - How to configure daylight saving time for the United States in 2007
KB 930688 - Deploying Microsoft Windows 2000 updates for daylight saving time changes for worldwide use
KB 923027 - How to configure daylight saving time for the United States and Canada in 2007 and in subsequent years on Windows CE-based devices
KB 918645 - How to configure the daylight saving time start date and end date for Guatemala in Windows
KB 921095 - FIX: U.S. daylight saving time changes in 2007 do not occur on the correct day on Windows CE 5.0-based devices
KB 930858 - Description of Software Update Services and Windows Server Update Services changes in content for 2006
Exchange Server
KB 930879 - How to address daylight saving time by using the Exchange Calendar Update Tool
KB 926666- Update for daylight saving time changes in 2007 for Exchange 2003 RTM
KB 931978 - Update for daylight saving time changes in 2007 for Exchange 2003 Service Pack 1
KB 932658 - Information about the changes to daylight saving time in 2007 for Exchange 2000 Conferencing Server
KB 932599 - You can no longer mount any of the Exchange databases after you apply hotfix 926666 to a computer that is running Exchange Server 2003
KB 931667 - Addressing the daylight saving time changes in 2007 using the Time Zone Data Update Tool for Microsoft Office Outlook
KB 891629 - The time of an appointment that is contained in an e-mail message is changed when the message is sent or received by an Exchange 2000 computer that uses the Microsoft Exchange Connector for Novell GroupWise
KB 924580 - Appointments appear off by one hour when you use Collaboration Data Objects to obtain calendar information from Exchange Server 2003
SharePoint Services
KB 924881 - Description of the update for Windows SharePoint Services: January 9, 2007
KB 888253 - How to configure time zone information in Windows SharePoint Services by modifying the Timezone.xml file
Also check my last post for Mobile specific DST updates.
I am actually amazed how much grief this DST change has caused everyone in general. I suspect all the energy saved in the first year will have been spent on getting all of our software and hardware solutions in sync and working properly. Something like this shouldn't be 'the new Y2K problem'.