The Muralitharan thing - yes Hair was the only umpire that called him, but I believed he chucked, and i still don't think his action should be allowed. I don't see any 'racism' in that.
From the current crop of bowlers, Akhtar at times I do believe has a funny action, as does Harbajan Singh at some times.
One thing i've noticed, is that these bowlers come out with the long sleeved clothes to 'cover it up' more. It makes it less noticeable, but I still believe there is a flaw in harbhajan's action.
Outside the subcontinent, Brett Lee is the only one I can think off, of the top of my head.
So I guess in that sense, there hasn't been much outside the sub continent to call a no ball on.
This time i'ts been blatantly stupid, but really, i'm not sure if racism is the factor for it.
Other than these two things, i can't recall anything MAJOR (bad decisions happen all the time to any umpire)