What is podcast, webcast, video blog, ...
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download:
    audio or video
    You click on the link, download the file, save it, and then play it
    on your computer.

podcast:  also vodcast (for video podcast)
    is available via RSS. 
    audio or video
    Can be viewed/heard on an iPod or mp3 player.
    http://www.boutell.com/newfaq/definitions/podcast.html
    http://learninginhand.com/podcasting/
    http://www.freepodcastcourse.com/the-difference-between-video-blogging-and-podcasting.html

video blog:  also vlog
    on a (blog) web page
    You shoot the video, upload it to your computer, upload it to your web
    server or the host of your video blog, write a short description of the
    video on your blog post, and use code to make the video display on the blog post.
    People can comment etc just like a regular blog.
    http://www.freepodcastcourse.com/the-difference-between-video-blogging-and-podcasting.html

streaming:
    The user plays the audio/video directly off a website, without downloading anything.
    The file is "streamed" from a media server directly to the person's computer. 
    When the stream is stopped, there is no file to be saved, copied, 
    edited or redistributed. A person must click on a link to the file
    to start the stream.
    http://www.law.harvard.edu/about/administration/its/media/streamvpod.html
    http://www.boutell.com/newfaq/definitions/streaming.html

webcast:
    Uses streaming, plus may have other content such as slides that are
    synchronised to the audio or video,  downloadable content such as workbooks 
    and PDFs, a text-based version of the audio, etc.
    Could be live or not.
    http://webseminars.co.uk/?p=14

And just so we know ...
blog:
    Journal entries or articles in chronological order, newest first,
    http://www.boutell.com/newfaq/definitions/blog.html

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