Various Summary Stuff =====================
`gnus-summary-mode-hook' This hook is called when creating a summary mode buffer.
`gnus-summary-generate-hook' This is called as the last thing before doing the threading and the generation of the summary buffer. It's quite convenient for customizing the threading variables based on what data the newsgroup has. This hook is called from the summary buffer after most summary buffer variables has been set.
`gnus-summary-prepare-hook' Is is called after the summary buffer has been generated. You might use it to, for instance, highlight lines or modify the look of the buffer in some other ungodly manner. I don't care.