Just a quick comment -- the MBA, as opposed to similarly spec'd (CPU-wise) Macs, uses a different hardware design. Remember that the entire board has been shrunk to accommodate the tiny processors, memory, etc. as opposed to a rather huge board found in iBooks, Powerbooks, Macbooks and Macbook Pros. The fans are also smaller and has far less room compared to the other models. There will be trade-offs.
What I am trying to say is that it is not fair comparing MBA to anything that uses a different hardware configuration. Try something that uses the same smaller hardware design from Intel.
One last thing -- maybe what we can do is set a standard test set so we can all test our MBAs and then finally arrive at the same conclusion. Say use the same set of videos, running in the same configuration (full screen, etc.), and record the room temperature, start temperature, MBA temp, MBA fan rpms, etc.
