Microsoft and Sony currently offer two very different digital download services. Microsoft's Xbox LIVE Arcade offers mostly simple games, both in design and presentation. New games are released regularly and for decent prices. Sony's PSN offerings for the PS3 have been very different. So far the service has received an online version of Tekken 5, brilliant multiplayer action game Warhawk, Gran Turismo 5 Prologue and more. But WipEout HD could top them all in the "this is good enough to be sold in stores" stakes.