Xming

Xming screenshots

Xming is the leading X Window Server for Microsoft XP/Vista/Windows7
Multiwindow mode on Microsoft Windows 7
Xming 7.5 : Multiwindow mode on Microsoft Windows 7

Alternative downloads

EMU SSH Suite
The EMU SSH Suite consists of two free tools for Windows.
1.0
FREE
Putty Toolkit
Set of tools that are part of the PuTTY applications.
1.0
FREE