Well like Jont's early post on this thread I worry about the Microsoftisation of education, not because they are bad products but increasingly it is not a level playing field for competition. Large organisations are struggling in the Web 2.0 because innovation outpaces their business practices. The Microsoft and Yahoo failed courtship shows it nicely.
There is no doubt that the various OS's have their champions but for me its about finding the right tool for the job. I use mainly an Apple Mac but out and about the Asus eee does what I need relatively cheaply with the tools I need. It's saddening (and as a taxpayer maddening) that when we need an agile workforce so many institutions are throwing away the opportunity to teach learners there is more than one OS and content can work across platforms. Ahh that's my tuppence's worth

Good discussion got me thinking!