Here are a couple tools that we have found useful for resizing NTFS partitions on Windows servers:
For a commercial tool with support that supports Windows Server 2003 and 2008, try Acronis Disk Director 11 Advanced Server. A free trial is available.
For an open-source tool without support, try the gparted Live CD. This is a Linux Live CD that includes a graphical tool, gparted, that supports resizing NTFS partitions.
If you would like assistance with resizing and NTFS partition on your Windows server, the Eclipse Systems team is available for billable, after-hours services engagements. Please enter a service request with details, and a quote will be provided.