The licensing update poll has been tallied.
"Yes, I am in favor of this change" : 13242 (75.8%)
"No, I am opposed to this change" : 1829 (10.5%)
"I do not have an opinion on this change" : 2391 (13.7%)
Total ballots cast and certified: 17462
This is quite a good result, and one that I am happy to see. The WMF board has not made a final decision on the matter, but I sincerely hope that they pursue this license migration.
Update: The board moved pretty quickly on these results, and have already written and approved a resolution:
Whereas the Wikimedia community, in a project-wide vote, has expressed
very strong support for changing the licensing terms of Wikimedia sites,
and whereas the Board of Trustees has previously adopted a license
update resolution requesting that such a change be made possible, the
Board hereby declares its intent to implement these changes.
Accordingly, the Wikimedia Foundation exercises its option under Version
1.3 of the GNU Free Documentation License to relicense the Wikimedia
sites as Massive Multiauthor Collaborations under the Creative Commons
Attribution-Share Alike 3.0 license, effective June 15, 2009. The Board
of Trustees hereby instructs the Executive Director to have all
Wikimedia licensing terms updated and terms of use implemented
consistent with the proposal at
http://meta.wikimedia.org/wiki/Licensing_update
So it looks like Wikibooks (and all other GFDL WM projects) will be migrating to CC-BY-SA-3.0 dual-licensing by June 15th. Quite a cool thing to happen!