• specific, concrete terms
• speaking the user's language
• making headings clear
• balancing brevity with clarity 
• making headings distinguishable
• making headings scannable (i.e. front-loading phrases (see Nielsen article - same idea as for links))
• combining related topics (e.g. foobar & bleem)

For more on this, check out ~web or book link.

Next: Team-sourcing ideas