Hi Dorothy
If you are interested in simply serving short videos and static web content, you may be interested in using this device as an alternative to the RPi:
It is a very simple and robust wifi router that is set up to serve basic content to small groups of users in a straightforward and stand alone manner. It has been developed with the intention of using it in remote and rural schools where there is no Internet access.
It does not do the more advanced functions that RACHEL Pi offers, such as Search across wiki text or the KA Lite application. But for simple serving of static content and short videos it is quite effective.
The VT project plans to offer the unit pre-programmed and with the standard 32GB RACHEL library on board as a 'turn key' appliance via their on line store shortly.
As Jeremy has mentioned, adding your own content is fairly straightforward. As well as the built-in facility in RACHEL Pi, you can put the SD card in your PC and add and remove files as required.
If you are adding a whole set of video files, you will probably need to also have a HTML web page to allow users to navigate to the video that they want to view.
Something else to consider is the size of the video files. Many training systems use a collection of short videos around 5 - 10MB in size, and this works well in these simple systems. The Khan Academy videos are a good example of this.
But if your content provider is making 'feature length' videos that are hundreds of MB in size, then you may run into issues effectively serving the content to a group of users.
Regards
Terry