Lately I have been working more in emacs, trying to see what I can do with it. The keyboard shortcuts are a bit arcane, but when you get used to them it' actualy fun to work with. This post for instance is written in emacs on my laptop.
I have already setup my email with notmuch and offlineimap. This allows me to read and write mail in emacs. And the next thing I'm working in is to learn to use org-mode with org2blog. Org2Blog is an addon to erg-mode, a emacs major-mode that help organise your life. It can handel to do lists, write documents, handle you agenda and morep.