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This combined with some of the markup used in the latest Yahoo Mail design - CSS positioning, divs instead of tables - some really interesting stuff going on there too. As for the Yahoo Calendar, it is using the "sliding doors" markup from ALA for the tabs. (Some insight from the design company responsible for the redesigns here [littleyellowdifferent.com].)
OK, none of it validates yet, and there is quite a bit of legacy markup in there, but are we starting to see the transformation of the web's worst tag-soup proponent into a supporter of web standards?