Those benchmarks are very strange - why does the worst-specced Mac boot OS X the quickest? And mine only takes about 70 seconds to boot Tiger, and they're saying their G4 took longer than that! It looks as though the G4 is only significantly faster for specific things, like Photoshop tasks (which is presumably optimised for AltiVec) - though of course iLife '06, Toast 7+, Leopard etc have all been kicked off the G3 by their makers (mainly Apple) :'(