Possibly the single most significant thing about Wave is that Google are recognising the potentially unlimited development resources available through the open source community. And that’s where KO might just find a new lease of life. We’re all familiar with the ongoing debate, a little less polarized now than it was four years ago, on formal taxonomies versus folksonomic tagging à la del.icio.us or Technorati. Wave, it seems, has adopted a flat tagging approach similar to Twitter hashtags. However, there’s lots of room between the two for rapprochement, as evidenced by the emergence of RDF-style machine tags (triple tags) on Flickr a while back, or by Wikipedia’s extensive category tree. Open Intelligence, a knowledge-sharing site set up by ISKO UK member Jan Wyllie, is pioneering a faceted tag system which may just provide some clues to where KO might be going in the Web 2.0 world.