@Addison: Your are welcome.

I like this little feature so much that I would like to share the following modifications:

Instead of Escape, I use now Control + Escape. Moving to a terminal window with the previously mentioned Shift button makes the first letter capitalized. Thus, Control.

In addition to the hardware keyboard of the N810 I use an Apple wireless keyboard. So there - to make switching windows even more handy - I use the "eject-button" (top right of the keyboard). So this then is a single key to switch to the next windows.

When using this external keyboard I have also made a switch back to the previous window. The button to be used here for is Control + "Eject Button" on the Apple keyboard.

One more addition: I added the line "/usr/bin/xbindkeys" to my /home/user/.bashrc. Thus, when opening a terminal window, xbindkeys will start automatically. To make it system wide one probably would have to add it to rc2.d and init.d.