@evildictaitor: Yes, as I said, these internet-based numbers are always fuzzy at best, and so you'd be a fool to make any solid conclusions based on them, but they can give some indications regarding patterns, when comparing (assuming the data is comparable) against previous data.

I am certainly not going to call it yet, based on these numbers, but claims based on sales figures are also going to be misleading (sales to who/where? and that entire downgrade of new purchase issue) so usage figures are possibly more meaningful, provided you can gather stats that are trustworthy and actually reflective of the market.

FWIW, here is their explanation on methodology - http://www.netmarketshare.com/faq.aspx