Addition to this post made on 20/11/12 – if you are wanting to embed a cropped YouTube video into Moodle then visit http://davefoord.wordpress.com/2012/11/20/cropping-a-youtube-video-before-adding-to-moodle/
YouTube is a wonderful source of videos that can be used very effectively within education, but quite often we only want to show a certain part of the video rather than the whole thing. There is now a free and very easy to use method for doing this called TubeChop, and the output from this can be embedded easily into PowerPoint. One of the great things with TubeChop is you don’t even have to create an account on it, so no passwords to remember (or forget!)
Here is a screencast showing how easy this is to use.
Here is an example of a Example Of TubeChop In PowerPoint.
Although not shown in the screencast, TubeChop will also give you some embed code, so you can embed the chopped video into a blog, VLE or webpage. This is particularly useful to Blackboard users, as if you try to embed a YouTube video directly into Blackboard, you can run into difficulties as Blackboard cannot handle iframes (unless you remember to change the settings in Youtube to give the old embed code).
TubeChop (at the moment) doesn’t use iframes, so works well with Blackboard.