Beastly Mispronunciations
The Big Book Of Beastly Mispronunciations: The Complete Opinionated Guide For The Careful Speaker by Charles Harrington Elster offers suggestions on how to pronounce thousands of words and expressions. Here are 100 examples!

Diction, Detail, Etc
Worksheets on diction, detail, figurative language, imagery, syntax, etc.

Diction Exercises to Make Sure They Get Your Message
Diction Exercises? Why should you do them? Because your speech content may be great, you may look fantastic but unless your audience can understand what you're saying, your message is lost.

Female Voice Training Exercises : Proper Singing Diction
A video on YouTube. (2m34s)

Free Word Games
Free word games develop fluency, spontaneity and confidence while having fun.

How to Practice Diction for Vocal Exercise
Add diction practice to your daily vocal workouts. Remember that your goal is not to conjure up an accent but to vocalize the lyrics you're singing as distinctly as possible.

How can you learn to speak better for acting?
When I speak while in class sometimes it is hard for people to understand me. ... I need to learn to speak more clearly and louder. Any advice?

The Online Communicator: It's Hard to Say
A good way to improve one's delivery of normal phrases is to practice on difficult ones. Such practice can be especially valuable when real-life tongue-twisters occur in the middle of "normal" scripts, while the clock is running and the producer waits impatiently for the announcer to complete Take 43.

The Professor’s Voice
Like politicians, singers, actors, and preachers, teachers rely on their voices as a rich resource, capable of conveying, clarifying, and emphasizing ideas and feelings.

Twist your Tongue with these Tongue Twisters Today!
Regardless of your vocal needs, tongue twisters are a great way to warm up vocally and improve your diction.

Voiceover Exercises
Exercises in breathing, articulation, inflectional changes, etc.