Peter Mead has four excellent posts entitled "10 Ways to Half Preach the Text" here, here, here and here.Make sure to read Peter's entire posts, but here are the ten.
1. Say just enough about the text to introduce what you want to say.
2. Preach from the details, but don’t figure out how they work together to give the main idea.
3. Preach a generic message or idea from what could be any text.
4. Use the content, but ignore the context.
5. Use the context, but ignore the content.
6. Impose a sermon structure instead of letting the text’s structure influence your message.
7. Preach a preferred cross-reference.
8. Preach a plethora of cross-references.
9. Explain it, but don’t apply it.
10. Commentary it, but don’t proclaim it.