vim is my favorite editor at the moment. I have line numbering, the darkblue-colorscheme and some small helpers for editing html or xml-documents in my .vimrc.

set nu!
colo darkblue
inoremap ,,, <esc>diwi<<esc>pa><cr></<esc>pa><esc>kA
inoremap ___ <esc>diwi<<esc>pa /><esc>h
[download]

vim is not an ide comparable to VisualStudio or Eclipse, but I like it small and simple.