This is a long set of videos, but each is well-referenced from an index and a program for keeping your place and bookmarks. Each is thorough and clear, worked-up from a careful investigation of what a user needs to know for each e-commerce plugin. WP e-commerce is the main one and badly documented. I do not think I could have used it without this set of videos. For example, the videos point-out that there are two sets of support material online, one out of date and one current. They point-out the way that variations are meant to work, which flummoxed me for days before I got the video.
Sometimes you can guess from the sound that two talks have been spliced together for clarity; so this is carefully edited. But the speaker sometimes says "I don't know what this is - let's see", or anything to give the talk a more spontainious and natural lilt.
George Plumley speaks slowly in a mild accent, rather like Alistair Cook in Letters from America years ago, that's pleasant to listen to.
If he can find a plugin that offers a matrix quote shipping system for people in countries where the post office is unhelpful to plugin writers, like the UK, that would be great but I have only listened to a couple of plugin reports so far and there are more to go.
I hope that the publishers of wordpress e-commerce plugins buy this video, transcribe it, and maybe do some kind of deal to have free support material done in the same way because I think developers are notoriously bad at de-bugging their own instructions or spotting problems from a users' point of view.
Wordpress is a one-click install on several free webhosts, or Bitnami provide a free version to download on to your hard disc with a stack of programs like a database to support it.