Re: @thondwe - Eh?
"Care to point us to one or two medium/large corporations using Linux on their desktops?"
Many universities and other research institutions have a significant proportion of scientific researchers using Linux, and usually with some flavour of systems configuration software in place to set up and manage the machines.
There are a number of high profile deployments in France: the Gendarmerie, parts of the military, etc. There are similar stories in other European (school set ups in parts of Spain, for example) and South American countries. There are also the likes of Google (and I think also IBM?).
It would be good if someone was curating a big list out there somewhere (they probably are, but I just don't know of it).
Obviously it depends on what your uses are, but with increasing amounts of software being web-based these days, the OS you use is often less important, unless you specifically need some software that only runs on Windows (and many specialists do, of course, but it doesn't necessarily mean that the whole organisational setup needs to be Windows based).