We now have an importer available for the OLD
WWWBoard 2.x version. This importer is fairly basic, since WWWBoard doesn't actually have real users. This will create a single forum and import all of the topics, retaining the original parent/child structure of WWWBoard.
All posts will be imported as Guest posts, however the poster name will be imported from WWWBoard.
You can follow the basic import instructions
to get you started.