UPDATE [8 APR 2011]: The RSAT Tools for Windows 7 SP1 has been released and can be downloaded here – http://www.microsoft.com/downloads/en/details.aspx?FamilyID=7d2f6ad7-656b-4313-a005-4e344e43997d
One of the most useful tools for administering a server from your desktop is the RSAT toolset, which are available via the MMC console. With these components, you can administer the AD, and various other components of the Server Manager Console via the workstation.
In Windows7, you have to install the RSAT tools to accomplish this task. KB974877 describes the tools, and provides a download link:
Once the tool has been installed, you need to enable them via the control panel, Programs and Features, Turn Windows features on or off.
Then, pick and choose the features you need.