iPhone doom is a port from an existing GL port of doom (namely prboom) back to idsoftware and onto the iphone. So yes, someone has done it years ago, and yes, id leveraged that.
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There's a good article in Wired UK ish 1 (online at http://www.wired.co.uk/wired-magazine/archive/2009/04/features/the-man-who-saved-the-bbc.aspx) which covers some of the internal culture change that happened around when the iPlayer got revamped and lost its windows-only roots.
We must have been using a different GNUStep.
I'll second that. The n2100 can barely manage 10Mbps in my experience, despite having dual gigE NICs.