Directly from CODEPLEX this free tool is a secure, multi tab terminal services/remote desktop client that uses Terminal Services ActiveX Client (mstscax.dll).
CODEPLEX started this project from the need of controlling multiple connections simultaneously. It is a complete replacement for the Windows mstsc.exe (Terminal Services) client.
Terminals allows storing multiple remote connections of varying types (RDP, VNC, VMRC, Telnet, SSH1, SSH2, ICA Citrix, RAS and HTTP) you also have the possibility of arranging them by tags or in groups. Using Active Directory or scanning a range of IP addresses allows you to create new connections.
Terminals allow you to import RDP, vRD or MuRD files.
But there's more, check it out the System Requirements and the Download file at CODEPLEX, additionally check the Terminals 1.7 - Vista + 2008 Support.