Debian is the leader in pushing for a completely open distribution and Ubuntu is the the leader in the noobie category so they are both comfortable.
Redhat and SuSE are handling the server side and for mobile we have new (somewhat anyway) distributions like meego.
What's left? Desktops for high end users? That category is were I would guess you find a lot of Fedora, OpenSuse and Slackware people.
I am sure I missed lots of distributions and I am not saying I am accurately representing the market distribution. I just used them as examples.
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