displayset is a script that provides a useful transition between LCD panel and
dual external monitors.  The script is currently configured for the Lenovo
Thinkpad X201 and two 4:3 1600x1200 external LCD monitors.

To tie into XFCE, create two new keyboard shortcuts:

<super>l -> /usr/local/bin/displayset lcd
<super>d -> /usr/local/bin/displayset dualext

Read comments in the displayset script for more information