Bismillah. Saudi has announced today that tomorrow (Friday 28th October) is 1st Dhul Hijjah, so Eid al-Adha will be on Sunday 6th November 2011, God-willing.
This fits the astronomical data, if one accepts a “global” approach to crescent-sighting since it was visible in S. Africa tonight. Any Saudi claims of naked-eye crescent-sighting tonight are highly-dubious, as usual, although telescopic sightings were possible (see http://www.crescentmoonwatch.org).
May the Month of Pilgrimage be a blessed one for all!