Here is what I have learned in dealing with this:
1. Safari will not work in integrated mode
2. Firefox works, and looks fairly similar to IE IF (big if) you
modify the mac style sheets. Why in the world MS just didn't make one
stupid style sheet following W3C spec I don't know. I modified the
style sheet so it appears the site looks the same in for the most part
in the same browser. Mostly this just requires changing the font sizes.
Other than that, what other compatibility / workarounds are you
looking for? We have about 20 MAC users and they are using the site.