Each video has a textual transcript (which isn't exact, but captures the gist of what the lecturer says well) with good screenshots added. The lecture videos also have captions for people who like to read along as they listen and watch.
Yes, for everyone here worried about text - it is available! However, beyond that I've been pretty unimpressed* with the course. So far it's been more along the lines of basic searching techniques. For example, topics covered:
1) Using ctrl+f
2) Refining searches with color choice in images
3) Auto-completion
4) Instant search
It feels more like an advertising program than a real attempt at turning us into search masters. TBH, I except that this will be more helpful to more people, but not that helpful to the typical LWer. I hope the later presentations pick up.
(*) Aside: I was going to use the word "nonplussed" here before stopping and realizing that I didn't really know what it means. Turns out there's a good reason for that: the two definitions for it that I got with my awesome google skills were: 'confused' and 'unperturbed'. Consider me nonplussed about the word 'nonplussed' - by either definition.
I've registered for the course. Already I've learned new things. I can feel my google-fu growing more powerful.