MultiDesk is a tabbed remote desktop client (terminal services client).

Features:

Only ONE executable file, small, fast (written in C++), green!
Portable and SSD/flash drive friendly
New style: status bar and fit window with margin
Manage remote desktop connections in groups
Drag and drop support for moving servers and groups
Tabbed connections
Connect to console
Change connection port
Inherit username and password from group properties
Redirect specified drives (Need RDP 6)

Requires Microsoft Remote Desktop Connection (Terminal Services Client) 6.0 or higher (optional)