Moving to vim from TextMate, I found that I missed TextMate's autocompletion.
In Vim you have to specify whether the word you're looking for is above or below the cusror (using C-P or C-N). IIRC, TextMate just looks for the closest matching word, no matter where it is.
I wrote a little plugin to do make it exactly that:
The 'West Ham Industry' map is about the area of London called 'West Ham', rather than the meat, as the title suggests. Hopefully that should save anyone else wondering why oranges are needed to make ham...