I've been digging deeper and deeper into vimscript and also scripting vim with python. It's so amazing what you can do with just a few lines of hacky vimscript!

Today I made it so that every time I open a .markdown file, vim compiles it to html and opens it in my browser (using 'open' command on OS X). It also updates it automatically every time I save or leave insert mode.

I've also hacked together a python REPL inside a vim window. (Wasn't very hard, as vim has python built-in.)

Once you realise that Vim is just an extension of the command line, a new world opens up. Everything you can do from the command line, you can do from Vim. Throw in Python and the options are endless... So much POWER!!

BTW: I also discovered vim has MzScheme built-in, so don't go for emacs just because of lisp... Vim has a nicer lisp! Come to the dark side, we have cookies! (And lisp.)