Just an idea, but I wonder if Apple are waiting until they've hammered all the bugs out of Leopard before making new Mac Pros available? Maybe until 10.5.2? It would make sense, not wanting to ship their flagship product to pros who need their machines for productivity purposes, if Leopard is still too buggy. Once the OS is nice and stable, they can then release stonking new machines that'll blow everyone away, without having to worry about them being impaired by software issues. Any thoughts?