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Xpra gives you the functionality of GNU Screen for X applications.
 .
 It allows the user to view remote X applications on their local machine, and
 disconnect and reconnect from the remote machine without losing the state of
 the running applications.
 .
 Unlike VNC, these applications are "rootless".  They appear as individual
 windows inside your window manager rather than being contained within a single
 window.

Homepage: http://xpra.org/

To start an application (a simple xterm in this example) on a remote system and display it on your local machine, simply run:

xpra start ssh:SERVERHOSTNAME --start=xterm

This is similar to ssh -X, except that performance will be noticeably better and you can disconnect and re-connect to this session as many times as you like. (obviously xpra must be installed on your server host)
To re-connect or to connect to this session from another machine, use the attach command (you can also use the xpra_launcher GUI):

xpra attach ssh:serverhostname

You can find many more usage examples here, ssh is not required but it does make things easier. 

Xpra gives you the functionality of GNU Screen for X applications.
 .
 It allows the user to view remote X applications on their local machine, and
 disconnect and reconnect from the remote machine without losing the state of
 the running applications.
 .
 Unlike VNC, these applications are "rootless".  They appear as individual
 windows inside your window manager rather than being contained within a single
 window.

Homepage: http://xpra.org/