Light Keyboard?
 

http://www.wired.com/news/gizmos/0,1452,58949,00.html

and see this video:

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<PARAM NAME="FileName" VALUE="http://www.canesta.com/videos/keyboard.wmv">
<PARAM NAME="autostart" VALUE="0">
<PARAM NAME="showcontrols" VALUE="1">
<EMBED TYPE="application/x-mplayer2"
SRC="http://www.canesta.com/videos/keyboard.wmv"
WIDTH="320"
HEIGHT="240"
AUTOSTART="0"
SHOWCONTROLS="1">
</EMBED>
</OBJECT>

I want one :)

Is that ever going to be produced?

I've seen it in the prototype stage a few years ago.

"Canesta is working with at least one company, Nec, which is evaluating the system for applications in its Tablet PCs, Spare said. Virtual keyboards likely will be available in time for Christmas, he said. "