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The best way is to run Windows as a virtual machine within OSX using a program such as Virtual PC:
[apple.com...]
[microsoft.com...]
Only at version 0.4 though.
IE for Mac is less of a problem these days as it is not installed on modern Macs, support has been discontinued by Microsoft. Most Mac users favor Safari, and it is that browser which is most important for Mac testing.
The most reliable way remains the purchase of a low-end or second-hand Mac running a recent version of OSX.
mankatorules, (welcome aboard!) there are indeed a lot of Macs out there that have not moved to OS X and have IE still running, I have one of them specifically for the purpose you need. The deal is if your boss wants to review the site on Mac browsers, he's going to have to buy you a Mac, period. Even if it's OS X, (which I'm pretty sure IE for Mac won't run on, it only runs on OS 9) it should still be available for cross browser testing.
Yes you can get and install emulators, but they are just that, emulators. Perhaps it will suffice for your purpose but the point is if your boss wants this he should fork up the dinero to get you a Mac.