Vim for almost all coding (except for Java: I still use vim for rolling out tiny programs but since eclim, the Vim plugin for eclipse is not very good, I am forced to use eclipse). I use emacs in vim-mode as a GTD planner, mainly because org-mode is an incredibly useful planning tool that I am able to use on any machine that is linked to my dropbox account as long as I know the markup.
Forgot to add: One another situation where I would use emacs is if ever I really got into R. ess (emacs speaks statistics) is quite good compared to vim equivalents.
