time between annoucement and availability

The time from when Jobs' would announce products at Apple's show to when you could get them is really, really variable. Also, if they do pre-orders, they have to be satisfied first, and some brand new Apple products have a tendency to 'sell out' within a few hours, resulting in a week or more delay for replenishment (ie: people sleeping outside Apple store and showing up at 2AM to get the iPhone 3G)