I thought his cell was busted a while back...
I've been looking for references -- especially since CAIR was calling for a boycott -- but haven't found a list (surprise!)
From the official WH version: "Guests included ambassadors from African, Middle Eastern, European, Central Asian, and East Asian countries, as well as representatives from several Muslim American organizations."
These are the only specific names mentioned in Bush's remarks: Colin Powell, Spence Abraham (Secty of Energy), Sheikh Hamdan bin Zayed, the Deputy Prime Minister and Minister of State for Foreign Affairs for the United Arab Emirates, and Imam Faizul Khan, who gave the invocation.
One story that I read mentioned that there were Muslims holding their own Iftaar as a protest outside the White House.