Anyone who thinks that Apple's products are so closed loop that they don't work with anything except Apple products, has never owned/experienced an Apple product. Period.
I know of one person who has an HP peecee, and an HP printer, and an HP HDTV screen, and an HP digital camera. In order to operate their printer, they had to download drivers, and call customer service to fix bugs. In order to get their peecee to recognize their printer, they had to install software, download drivers, and read many pages of text instructions. In the midst of all this plug and play fun, a virus corrupted their BIOS, and the system crashed. Will they have the same seamless integration between their HDTV screen and their peecee that they had with their other same brand periphery? I'll bet they do. How much of this scenario is because of HP, and how much is the fault of MS?
On the other side of the brain--- I bought a closeout model G3 iMac in the year 2000. I went to a big box store and bought a Kodak digital camera. (It did not say on the box that it would work with anything other than the Windows operating system, so I had no reason to believe that I should expect it to function with OSX.) I snapped some photos, removed the cameras CF memorycard, put that into a 5 dollar card reader, and plugged the card reader into the iMac's keyboard. A program that I had never used (called iPhoto) magically opened, and I was asked if I wanted to download my pictures. I clicked yes and all of my pictures were ready to use in ways that I was not aware of. I was storing, editing, emailing, printing, merging, boilerplating, and filing photos within a minute. No software needed to be loaded, no drivers to DL. I later bought a mini DV camcorder. Same story. I plugged the camera in using a cable that came with my iMac, and a program opened (iMovie) that asked me to press play. When I did, the camera began streaming video onto the computer with almost zero latency, and iMovie was organizing the video into frames based on when the rec/pause switch was toggled. Hey, it's not even a Genuine Apple Camcorder! My Epson printer, the 2 previous Lexmarks, and the one Canon before them all worked together as if they had been hand made by the same person. In reality, I was dragged kicking and screaming into the world of Apple, but I am still here (and anti-M$) because Apple makes the most useful, productive, and fun cool stuff in the universe. And it all works.
Explain to me how it is more expensive for me to have a system where everthing works when and how I need it to, versus something that may cost less to acquire, but wastes most of my time trying to get it to work (dL'ing drivers,debugging, loading on proprietary software, calling tech support, wasting days on chat rooms looking for answers, running into worms-viruses-malware, and equipment that locks down frequently). If MS made a car, would you drive it? What if they only made the engine, or the brakes, but someone else made the car? If market share is the only reason to buy any product, or the only indicator of a brands integrity, there would eventually be only one brand of everything.
And finally, why does it seem that most of the people who complain about Apple becoming a music monopoly with iTunes/iPod are windows fanboyz?