WPMUDEV has 40 (and counting) unbranded training videos that you can use for yourself and for your clients, included in their Pro membership at $35/month (with annual payment option).

They don't come with a plugin - which makes WP101 and VideoUserManuals easier for consultants to implement. But you can create a membership support site for your clients and embed the videos to organize them any way you like. Additionally, the WPMUDEV membership includes all their premium plugins and themes for the same cost.

They have a history of creating plugins that their members ask for. I think I'll go over there and ask for an admin-side video-training plugin I can use for my clients right now. Shouldn't take them very long - after all, they already have the hard part, the videos.