Gabor blogged about how IEs4OSX saved drupal.hu. I was impressed with his review so I tried it out myself. Now I don't have to boot up greedy 'ol parallels everyday just to update my hours in Quickbooks (It even runs activeX controls)! :)
I definitely recommend IEs4OSX.
Dean at M$ reckons IE8 passes the ACID2 face 'test'. I'm dubious. The screen shot is convincing, but I'll believe when I've seen it with my own eyes.