The RSS team at Microsoft has documented their right-to-left text support in IE7. Basically, they use the <language> element in the RSS, the default language of the Web browser and the manual browser settings to determine the reading order.
http://blogs.msdn.com/rssteam/archive/2007/05/17/reading-feeds-in-right-to-left-order.aspx
James Snell also points us to his Atom draft that addresses bi-direction text support.
http://www.ietf.org/internet-drafts/draft-snell-atompub-bidi-04.txt
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