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Isn't Dell the only major player even offering Linux right now? They're smart enough to realize that it's not ready for mass adoption. They're not going to push it to all users.
Desktop Linux is ready for adoption. The masses are not ready to adopt desktop Linux
On servers and mobile phones Linux has already been adopted. Edited 2010-07-29 21:16 UTC
As someone whose used/tried various versions for well over a decade, I love it as the basis for my Palm Pre but it's sadly disappointing as a desktop. It always seems just a little behind.
I think it will continue to be successful in niche/specific areas but will never grow on the desktop until several factors are overcome, including ease of upgrading individual apps.