This must be the previous model, before this latest refresh. Apple no longer sells a 2.8 GHz iMac and it has a smaller hard drive and half the RAM as the current 24". Not saying it's a bad deal; but prospective buyers should know it's clearance on an older model.
These are damned nice machines and I'd much rather have the dedicated video card than the integrated graphicsl in the current "entry level" 24-inch model.