How can it be that Adobe, one of the standard's biggest supporters, doesn't support ePub 2 properly?
I'm referring to Adobe Digital Editions lack of support in dir="rtl" attribute and direction:rtl CSS property.
According to the specs (1.3.5):
A conforming Reading System must render all OPS CSS 2.0 required subset properties.
ADE fail to do it...
Please refer also to the ePub conform group:
http://code.google.com/p/epub-conform/