Ummm... So people might sue Apple because the iPod supports Apple's proprietary file format but not Microsoft's proprietary format?
Definitely sounds fishy to me, especially considering the fact that iPod also supports non-proprietary formats such as CDs and MP3s.
90 percent of HD music players is not 90 percent of all computerized music players, and it's a tiny fraction of the market for all music players, especially when you count radios, CD players, and tape players. This is a very different situation from the Windows/Netscape suit, where Microsoft controlled 90 percent of the means of accessing the Internet. The Internet could only be accessed via computer, and Microsoft controlled 90 percent of that market. There are many ways to access music, and Apple controls only a tiny portion of them.