WinMerge - An Open Source visual text file differencing and merging tool for Windows. A great tool for comparing log files.
RealVNC - A remote access tool for system administration and shared workspace.
Virtual CDROM for Windows XP - Store all your CD images on hard drive and use them with Virtual CD-ROM.
ISO Recorder - Create ISO images of data stored on your hard drive.
MSDN Library - Subscription free download of MSDN Library to your computer, a valuable resource for IT people developing and supporting Microsoft tools, products and technologies.
Disaster Recovery for Microsoft Exchange - Guidelines on developing and implementing a backup strategy for Microsoft Exchange Servers.
Books Online for Microsoft SQL Server - The primary documentation for SQL Server.
Microsoft Baseline Security Analyzer - Perform scans of Windows systems to identify common security holes.
Microsoft iSCSI Software Initiator - Connect your server to iSCSI targets using regular Network Adapters.