As of October 1, 2006, DocBook v4.5 is an official OASIS Standard! The voting went right down to the wire, as many of the eligible voters had neglected to vote at all. However, of those voting, the approval was unanimous!
In other cool DocBook news, the upcoming UBL v2.0 OASIS Standard submission will include the DocBook "editable source!" Nice to see that some of the other standards are using DocBook as the basis for their documentation!