Proposal: Vi and vim
I haven't seen this question before: Will it be vi.stackexchange.com or vim.stackexchange.com? I would personally prefer vim since it's the name under which the software is known more, and as well, 2-letter name would be a bit too short to me.
(I know that UX.SE has a 2-letter name, but I don't like that either. However, they didn't have a much better choice. We do.)