Often the same places you see people talking about duallies you will see someone chime in "you dont want to do that, most programs dont use it!" and i'm afraid this article is just the same thing repeated over a few pages.
I have a dual cpu celeron 500mhz and a newer 733mhz pentium III system and the dually whups the 733 easily, no not on single cpu benchmarks (duh) but in USABILITY. It responds much quicker, I can encode mp3s and play a FPS at the same time without a thought. Who only uses their computer for one task at once, that person will be best with one CPU. Most people do multiple things at once, I might surf the web while something is working. I might code something while something else is rendering.
For any time where you have more than one thing using your cpu at once having 2 cpus is a blessing.

Now where are your usability tests? Run a duallie and a single cpu system, rip an album on both and now launch a game of your choice.....
My examples are a little extreme, even where you are browsing and emailing at the same time you will notice a difference.

I'm afraid your conclusion is laughable.

Actually, your use of system is NOT extreme. A lot of people work on computers - I mean really work - and a lot work from home too - and the number of people working from home is steadily growing - especially people who program and/or do graphical work. Those benefit enormously from having dual CPU systems - like you said, surf the web while something is rendering.

I often do things like surfing or playing some windows games and convert a DVD to DivX or MPeg4 at 25fps while bored at work. And when working compile and render while editing some other source code.
As people get more and more used to using computers they are beginning to learn HOW to perform several tasks at once by adjusting their workflow to make use of the computers ability to perform several real tasks at once and those people ARE helped by SMP. You dont need to know hardware in oder to understand that you can do more than one thing at a time.

The fact that an SMP system wont make your "surfing" or wordprocessor faster is damn obvious to anyone who is able to read and unserstand that article as its all written on the first page in very easy-to-understand english.