Ironically, Web2.0 is much like CSS 2.0. Although one was specced in advance and the other just happened, they both had/ve a lot of new things, some of which were/will be adopted, some of which were/will be unused, and some of which need/ed slight revision. Like CSS, when 2.1 comes out Web2.1 will be a more polished, mature technology. And like CSS, Web2.0 has major deficiencies that won’t be corrected until 3.0 ;)