Thanks to Helen Nicol blogging CommonCraft's excellent video-shorts...
All three of their "plain english" videos here for those of you who suffer with corporate Youtube filters, and below for those of you who don't!
[youtube=http://www.youtube.com/watch?v=-dnL00TdmLY]
[youtube=http://www.youtube.com/watch?v=6a_KF7TYKVc]
[youtube=http://www.youtube.com/watch?v=0klgLsSxGsU]