ABC claims the man to Blagojevich's right is Rezko,
A Middle East Web site shows a photograph of what it described as Auchi visiting Illinois government officials in April 2004, with Rezko visible on the right of the photo.
He doesn't look like Rezko to me and instead looks like Aiham Alsammarae shown here in photo I downloaded from the NYT: Escaped Minister Says He Fled Iraqi Jail ‘the Chicago Way’
Alsammarae would have been Iraq's Minister of Electricitiy at the time of this photo in April 2004 so I'm not sure he would have been in country for this event. But it sure doesn't look like Tony Rezko in the photo as ABC is saying here.
Rich originally linked the ABC photo here.
Another Auchi Blagojevich photo op from GMH's website.