W3C published the Web Content Accessibility Guidelines 2.0 working draft on 30 June 2005. A few points I'm very pleased with:
Table layouts
1.0 doesn't encourage you to use tables for layout. You can if you like as long if the table makes sense when linearized (1.0: checkpoint 5.3).
2.0 states that structures within the content should be programmatically determinable and that, when content is arranged in a sequence that affects its meaning, that sequence should be programmatically determinable (2.0: 1.3 L1 SC1 / L3 SC1). Something you can't do if you use a table for layout. However, to do this properly there are more semantic elements needed, like the ones described in Web Applications 1.0 working draft.
Non-text elements
1.0 states you have to provide a text equivalent for every non-text element (1.0: checkpoint 1.1).
2.0 is more nuanced. For example: non-text content that is not functional, is not used to convey information, and does not create a specific sensory experience should be implemented such that it can be ignored by assistive technology (2.0: checkpoint 1.1 L1 SC4).
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