Jennifer Lebedev has a lot of very informative videos on YouTube for learning English. In particular, she has quite a few very nice videos on Pronunciation. For her entire collection of YouTube videos, click here.
Her videos aren't particularly fancy. In fact, she mostly just uses hand-written cards, visual aids, and diagrams. However, she does a very nice job of speaking clearly, providing some notes for key ideas, and sticking to good methodology. She uses a variety of techniques to teach both segmentals and suprasegmentals.
Here is her series of videos on how to learn the /r/ sound.
The /r/ Sound: Lesson A (Part I)
The /r/ Sound: Lesson A (Part II)
The /r/ Sound: Lesson B (Part I)
The /r/ Sound: Lesson B (Part II)
The /r/ Sound: Lesson B (Part III)
