I noticed
this article today on Electonista which shows that Apple OSX is growing in market share while Windows seems to be dropping. I wouldn't be getting too excited however as Windows still has 92.52% of the marketplace. OSX has reached a new high of 5.27% which while apparently small is quite an increase for Apple.
The article seems a little lop sided however as they are really only classing 9 days sales of Windows 7 into the figures - I would say by the end of November it will be a more accurate result.
Allan Campbell: Heaven Media