Over on the MacRumors forums, user Wicknix has just released an update to his TenFiveTube app, which lets PowerPC Macs running 10.5 Leopard browse and watch YouTube! But how well does it work? To find out, we'll upgrade our 867 Mhz PowerBook G4 Titanium from Tiger to Leopard, and give it a spin. This PowerBook is the oldest and slowest officially supported Mac laptop on Leopard, so will this actually be usable? Let's find out!