well, for too many people it seems that the point is so that you have a shiny machine to run Windows on. And I did run Windows on mine, but OS X is my primary OS, and probably will be for quite some time, and i find it to be quite capable.
Firefox works on OS X, but I prefer Safari 3 since it integrates better with the OS. PhotoShop CS3 is Intel compiled, so it will run like a champ, and although you can get Office for the Mac, there are other free or more affordable solutions out there (NeoOffice, iWork)