One of the greatest things about Apple products is that they are unique in design and function. The first Apple desk top that I worked on was in college and I instantly fell in love with the software. Imagine my shock a few years later when the IBM compatible computer at work was running a similar program. It seems that everyone wants to copy Apple.
This could be a good thing. Some times being the best means letting people copy what you are doing but continuing to produce the best of the best - if that makes sense. I always flash back to the Beta vs. VCR match up where the best machine lost because it was so hard to find videos (or even a choice in machines). In some ways, I think that Apple is running into a similar situation.
It is, by far, the best machine out there. It is also the minority. Unless you are in design, then you are probably running an IBM compatible machine (only now I guess they are considered Microsoft compatible). Apple has been working hard to push its products over into the mainstream use, but until there are a variety of machines that are Apple compatible it will probably not be able to make it.