Bismillah. Please refer to the “next new moon” at http://www.crescentmoonwatch.org: the moon is invisible tonight but visible from most of the world tomorrow (Thurs 9th). Hence, Eid-ul-Fitr (The Festival of Breaking the Fast, 1st Shawwal 1431)should be on Friday 10th September 2010 for the whole world.
Saudi have the right date for Eid – they’ve announced it for Friday.
The ECFR / Leeds Mosque announcement of Eid for Thursday 9th September follows Sheikh Ahmad Shakir (using conjunction rather than visibility) and is similar to the Jewish method: it’s their New Year tomorrow (Rosh Hashanah).