Check out PowerTerm WebConnect for WS08 if you want some extra features for Windows Server 2008 Terminal Services for free:

• Ability to publish multiple applications from multiple terminal servers in one step.
• Ability to publish applications to specific users and groups.
• A web interface with single sign-on that only shows your published applications (and not all of them like in Windows Server 2008)

Note that WebConnect is not completely free. When you download the installation package you actually install the full version. After 30 days, only the free features remain with some limitations. More information about these limitations can be found here.