there is a workaround
[link|http://www.rutemoeller.com/mp/ibook/ibook_e.html|Screen Spanning Doctor].
Haven't tried it, but it supposedly adds the ability back to eMacs, iBooks and iMacs. Specifically models that can or cannot use the patch are [link|http://www.rutemoeller.com/mp/ibook/supportlist_e.html|listed here]. They have some [link|http://forum.macparts.de/|support forums] too.
Darrell Spice, Jr. [link|http://www.spiceware.org/cgi-bin/spa.pl?album=./Artistic%20Overpass|Artistic Overpass]\n[link|http://www.spiceware.org/|SpiceWare] - We don't do Windows, it's too much of a chore
