As you all may know with 'o' or 'O' you can insert a new line after/before the current line. But both commands enter the insert mode, which may sometimes not what you want. I put this in my vimrc-file to insert a new-line after the current line by pressing Enter (Shift-Enter for inserting a line before the current line):

map <S-Enter> O<Esc>
map <CR> o<Esc>

If you want to stay in the line where you have been before use the following maps:

map <S-Enter> O<Esc>j
map <CR> o<Esc>k

CommentsEdit

It's also a nice idea to map something like

nnoremap <C-J> a<CR><Esc>k$

because it's the opposite of Shift-J. A more sophisticated solution would be

nnoremap <C-J> ciW<CR><Esc>:if match( @", "^\\s*$") < 0<Bar>exec "norm P-$diw+"<Bar>endif<CR>

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For whatever reason, I was unable to get the suggest mapping with <S-Enter> and <CR> to work properly (both ended up inserting below). So I did:

map <F8> o<Esc>
map <F9> O<Esc>

Which works fine for me.

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<S-Enter> and <CR> will work separately in gvim but not in urxvt. See http://stackoverflow.com/questions/598113/can-terminals-detect-shift-enter-or-control-enter

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Since I have inoremap jj <Esc> in my .vimrc, it take not too much to type ojj or Ojj.