Put a brief outline of the lecture on the blackboard or overhead transparency before you begin.
Use examples to allow students to think about other examples that may be relevant to their experience.
Look at the class.
Speak loud enough for the entire class to hear.
Vary your tone of voice.
Start with a problem and interweave evidence and examples to lead to a conclusion.
Speak loudly and clearly, change tone, use pauses. Don't be afraid of a few seconds of silence.
Explain, recap, repeat and summarize main points and relate main points to current examples and applications.
Invite questions and ask questions. Encourage participation, involve the group.
Don't try to cover everything or give too much factual information.
Keep track of the time and pace your material
Don't talk when you're writing or facing away from your audience.
Don't read your notes.
Stress key words and pause for emphasis.
Notice your non-verbal behavior as well.
The Nuts and Bolts
Outline a clear purpose and objectives for the lecture: Write them down and mention them!
Attract attention relay an anecdote, pose a dilemma, ask a question, relate a humorous experience, refer to a context-related quote, introduce contradictory facts or opinions.
Establish any ground rules: are questions in the middle okay, or should students wait until the end?
Include a structure. Cover 3-5 concepts or ideas, provide advance organizers (relay what is coming and why it might be important), provide students with an agenda. Structure the lecture so that it flows from one point to another (opening, body [content], closing).
Summarize and highlight the main points.
Conclude with the key points and relate to the future--what should students do with the information from today?