The Vim Online site has lots of useful Vim tips and scripts as well as download links to the latest versions of this fine editor!
I found out about word completion quite by accident a long time ago, the previous link provides more detail and explains how to use your dictionary file as a source of words.
This is the most popular tip on the site. Use * to search for the word under the cursor.
word completion using tab instead of the usual CTRL-P.
The syntax highlighting sometimes gets screwy in long documents (over a few hundred lines), but there’s a way fix that.
