This is how to save a node body, or stuff in node_revisions table without calling all hooks. I had a large report to be saved (over 6MB) and all unpacking and hooks made the server not to fulfil the job in a good way. Then I used just the part saving to the node_revisions table instead.
This is how you can transform a CCK field and add it to the body content by using nodeapi
This describes two modifications I have done to my sites Fivestar module. The first thing is to avoid indexing of words describing the rate levels "Star labels", like "Poor", "OK", "Good" and so on. While you are there you can always add relation attribute to avoid unnecessary follow of the rate link.
The second thing to do is to add comment tag to avoid AdSense analysing "Star labels" as content.
Some notes about Drupal 6 node API.
This code adds a term for each new node of a certain node type based on the title.
It uses a hard coded Vocabulary name and search for its "vid". When the title on the node is changed it changes the terms name as well. When the node is deleted the term is deleted to.
Some notes on the operations in Drupal 6.x nodeapi hook