I also saw that IBM are also using a wiki to build new redbooks, a fine thing, as Tesha wiki at SAP would attest. If you visit the Redbook wiki, and you dig around carefully, you will see that it is powered by not Notes, not Qedwiki, not Ventura but by Confluence.
That quote is swiped from Vendorprisey’s Passion and the Enterprise blog post. You can participate in the Redbook wiki here.