Per /Archive 10 and previous discussions, we have decided to use the blue book pictured here, with the slogan "Open Books for an Open World" using a sans-serif block font for "Wikibooks" and a clean serif font for the slogan as depicted here.
The final logo has been created based upon these specifications - it is shown below with English text, no text, in black and white, in greyscale, and as a favicon.
For localized logos still needing to be updated, and coordination of the updates, see /Update.
SVG version with English text
SVG version with no text, for use until localized versions can be created
Alternate SVG version for use until localized versions can be created - with only the project name.