1. Terminal Services RemoteApp applications appear no different than local applications, tightly integrated with the task bar and new Windows Vista features like 3-D flip. Terminal Services RemoteApp helps improve the end user experience and reduce training requirements.
2. Terminal Services Gateway provides a highly secure connection between internal applications and data to users outside the firewall. It delivers critical applications and data to mobile employees without additional VPN infrastructure.
3. Terminal Services Web Access helps simplify application deployment by making applications available from a web page or a SharePoint portal without installing them on the local PC. Speed application deployment by quickly connecting users with the applications they need.
4. Terminal Services Session Broker delivers session-based load-balancing to a Terminal Services Farm. Terminal Services Session Broker helps bring better uptime and performance to your Terminal Services environment.
5. Terminal Services Easy Print leverages the client-side print driver (no server side driver needed) to enable fast and reliable printing to a local or network-attached printer. End users can more productively work from remote locations.
For More Information: http://www.microsoft.com/windowsserver2008/terminal-services/default.mspx
Terminal Server 2008 Technical Resources: http://technet2.microsoft.com/windowsserver2008/en/servermanager/terminalservices.mspx
Source:→ TechNet Blogs
Microsoft, Windows Server 2008, WS2008, Terminal Services, Terminal Server, Upgrade, Reasons