I know of one local college that has Mac's in their Media department, but insists on having them dual boot Windows/Mac OS (not exactly politically correct for the Mac purists).
Personal opinion is that Macs are OK for Media/Art, but when its down to delivering a wide range of applications and networking, it has to be PC's.
P.S. we don't have Mac's at the moment, but I know a Deputy Head has had a demo recently, and is interested. My argument is that the IT Support in house is PC based, and none of my technicians are keen on learning about supporting Mac's because of the limited field.