f you own a legal copy of the Mac OS X, you can actually "install" the Mac OS on your PC through some type of Virtualization program with the install. Then of course just install the EQ Mac Client on your Mac Install. VMWare is what many corporations tend to use to do this (works with a multitude of OSes), including the company I work for. But it can be extremely pricy for an individual to buy at the normal price, and then of course you need a legal copy of the OS you want to virtualize.
Luckily, I actually got myself VMWare very cheap at my job since... it's literally what we normally work with heh. So a small group of my co-workers have been playing on Al'kabor every so often this way.
For VMWare, it runs extremely well for me inside the Virtualization since it will use all your normal hardware (ie video card, CPU, etc). The emulated IO reads for load/zoning times is the only notable performance hit. Also with VMWare since you're running an extra OS inside your normal OS, it gobbles 1k memory just to run the naked extra OS. If you're extremely low on memory it could be an issue. But it's entertaining seeing the EQ Mac Client run inside the Mac OS, inside Windows.