MacBook Air Benchmarking against Intel Macs

I was looking over the benchmarks for the MacBook Air on Macworld when I suddenly realized something about these benchmarks; for the most part, the benchmarks were against the somewhat more current models of Mac. While this is a useful thing to benchmark with, considering the other currently available options, and it makes sense to gauge the MacBook Air against the current MacBook, but I find that comparison rather pointless; we know already the MacBook Air is going to be slower than any other Mac currently on the market. But what if you're in a situation where one has an older computer and wants to know how much faster the Air is compared to their old computer? The results are rather surprising (and in the extended); in short, the MacBook Air is slower than a majority of the Intel Macs ever released, but faster than most single processor PowerPC Macs. Many of the tasks on their benchmark are very CPU intensive and are a good marker for processing performance, making the Air more powerful if the Mac you own is over two years old, and only has a single processor.