hi, some time ago ICANN put up test IDNs. they set up a wiki using mediawiki : http://idn.icann.org
soon after that an issue concerning HTTP URLs for RTL scripts has been raised (actually i think i raised it, to be honest) :
http://idn.icann.org/Talk:IDNwiki#RTL_scripts_URL_directionality_problem_.28...
basically, for RTL scripts URLs are represented with "http://" to the left. this looks awkward for us RTL users because it breaks the hierarchy in the URL (it's better explained in the example above).
after making some investigation, i found that when you use a RTL localized navigator, URLs in the address bar are represented with "://http" to the right. which, i think, is an acceptable solution.
i think mediawiki parser should convert RTL IDN URLs to this format.