Vim + Dash = Killer Documentation Lookup
Dash is a great documentation app that I use a lot to look up methods for the various languages I use. I used to fire-up a browser and Google for the term I was looking for, but with Dash it makes it so much easier.
However when you combine that with an easy way to look up a certain method directly from your IDE — in my case Vim — then it becomes even more useful.
I recently chanced on this lovely Dash plugin for Vim which means — after mapping

Here's the mapping I added in my .vimrc to trigger the plugin:
nnoremap <leader>d :Dash<cr>