XHTML 2.0 to drop backward compatability

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Catching up with Zeldman sent me off in six different directions, of course, but I especially enjoyed reading Web architecture | XML zone : The Web’s future: XHTML 2.0 at IBM’s developerWorks site.
The proposed changes to HTML (I mean XHTML) sounds like steps in the right direction (ditching presentational tags, rationalizing noncontaining tags, dropping img in favor of object, etc.). Reading about them gave me this little frisson of excitement I remember from first learning HTML. All that power at your fingertips, with conceptual clarity possible as well.