I had run across this link awhile back and just remembered it. Its very funny stuff- this guy took an old 1986 Mac Plus (with System 6.0.8, MS Word 3.01, and Excel 1.5) against a modern dual-core AMD system (with Windows XP and Office 2007).
He lays all of the data out with charts and graphs like you’d expect in any system shoot-out. The surprising thing is that the old Mac performs many daily office tasks faster than the modern machine! From boot time, to loading applications to scrolling around a Word document.