Have you seen the footage of the incident? It doesn't prove that he made a racist remark, but to me the footage from just prior to the umpires' conversation implied that Harbhajan was attempting to apologize or say something conciliatory to Symonds, and later to Hayden. Harbhajan makes what seems to be a conciliatory gesture towards him but Hayden has turned away and raises his hand as Harbhajan keeps speaking, in a "don't want to know" gesture.
Could be wrong, that's just how it looked to me.
Jon Pierik, an Aussie sports journo, has said that Hayden apparently approached Harbhajan on Friday and told him that he had broken a pre-series pledge not to use the "monkey" gibe. Dunno if this has been mentioned so far, but apparently the whole incident arose out of Harbhajan smacking Lee on the ass with his bat (for no reason anybody can identify), and Symonds remonstrating.
Additional bad news is that the ICC are apparently standing firmly behind Bucknor, stating that he will definitely be umpiring at Perth. This is a really, really bad move. There are very mixed opinions in Australia regarding the whole racism affair, but nearly all our press concedes that India got a terrible dudding from the umpires, and that Bucknor MUST be removed.