To get this working, you must first install Microsoft Visual C++ 2010 manually with this installer: http://www.codeweavers.com/compatibility/browse/name/?app_id=7994
Then get DirectX 9 (Modern). Finally, download the web-installer from pcsx2.net and install that. So far, only zerogs graphics plugin works, GSdx does not work. Also to get audio working, you can use SPU2-X, but set the module to "2 - DirectSound (nice)" in it's settings. DVDs don't work directly, you have to convert them to an ISO. On my 2009 iMac (Core 2 Duo w/ 2GB ram), I have Kingdom Hearts running at 100% speed and Kingdom Hearts 2 running at 70% speed with no speed hacks. So it works pretty well. I'd love to have KH2 running at 100% speed though.