Two friends, Ian and Eric are the most recent solvers of the 2x2x2x2.
Ian asked me to let you folks know that he created a tutorial for it in
the form of a YouTube playlist and would love your feedback. I suppose
that means commenting on whichever video in the playlist seems most
appropriate to your feedback. It looks very thoughtful to me, but you
are the experts. The playlist is at
https://www.youtube.com/playlist?list=PLRiNDmMy00ODLOOnpT5aybqZm7Art-y3U
-Melinda