This article from this week's economist is very interesting. Quote:

What is striking is how little innovation there has been in the bits of the market that Microsoft dominates, and how much where it has little influence. Operating systems, web browsers and word-processing software all look much as they did five years ago. But not many people are using five-year-old mobile phones, handheld computers or music-sharing software.

Opponents of the case always argued that there was no evidence that Microsoft's monopoly was doing any harm. But the harm lay in the (necessarily invisible) innovation that did not occur. Conversely, much of the innovation going on in other parts of the technology industry owes a lot to Microsoft's absence.