Meaningless
Both the Gartner and IDC figures quoted for all vendors are estimates. It's only when the companies start filing their quarterly accounts that the true figures are known.
With regards to Apple (quoted for Andy Worth) IDC have put them at US 6.3% share whilst Gartner have them at 8.2%, with no percentages given for worldwide share from either. However, until the company releases their actual sales figures next week it's all just pulling figures out of different arseholes.
