Well, to quote Lionel Hutz, "There's THE TRUTH, and then there's the truth."
I'm always confused by "marketshare" figures, since everyone is working with a different definition of what "marketshare" actually is. Given the caveats these numbers come with, I'm not sure there's really much to infer about Apple's actual market penetration, since these figures represent seem to represent only a single and highly restricted point in time: useful for propaganda, but that's about all.
I'd much rather have concrete figures for the overall percentage of folks using Macs as compared to Windows boxes that represent sales from, say, the past five years. Ditto for iPods, though I'm not surprised they're losing some ground to cheaper and more robust players even if these don't work directly with iTunes.
Then again, Apple (Steve), has always been about having "better stuff" at a higher price point, which to me overlooks the fact that some folks simply want to surf the 'Net, check their email, and type Word documents and don't really care if they do it on a Mac or Windows box. Same for the iPods - anecdotally, I've seen a lot of youth lately using players other than the iPod when I ride the bus, and I have to wonder if the price point is the determining factor. On some level, simply having a portable MP3/MP4 player at all trumps the "cool" factor of an iPod. The youth I have seen with iPods seem to only have shuffles or 2GB Nanos more than anything else, which are at the lower end of the pricing spectrum.