Starting a new thread on Vim because just today I discovered some power plugins and tools that I hadn't been aware of before; and that makes me think that there must be other Vim users out there who have still other Vim-related tips and tricks to share.
He's also created a summary of the tips from that thread: Vim for Writers.
One interesting point he makes on the Vim for Writers page is how to handle highlights. I find I make a lot of highlights and annotations when researching and writing, but I've never thought about using Vim for that. The two solutions mentioned are vim-notebook and QFN.