Sorry if I'm being slow or have missed something obvious, but how are people with multiple macs in their house going to avoid having to download 4GB multiple times? Isn't it going to be tied to your iTunes account? In which case how does that work for a family or small business with a bad internet connection?
You realize you can copy an App you download to another computer or backup to a disc drive?
When you install it on another machine, iTunes launches and then checks to see if that account on that machine is authorized to run the app.
My assumptions (same as when I transfer apps to another computer):
1. After you download the "OS X Lion Install App", drag it to a thumb drive (from iTunes).
2. Put the App on another computer (desktop or put the thumb drive in), and launch the App.
3. iTunes opens up to transfer the App to the iTunes folder and verifies that you are authorized to use the App on that machine.
4. Launch "OS X Lion Install" and your on your way.
Works for all my existing apps between my PC fileserver, where I sync my iPhone, and my MacBook, where I sync my iPad.