Nice.
Great layout, navigation and presentation. Was pretty easy to follow.
Just a few suggestions on your walk cycles.
See if you can sorta make them a little more fluent/smooth. I pretty much use the same technique, yet those cycles seemed to always snap around in the loop, if ya get me :/
I think it's because you didn't use that many keyframes for the cycle. Usually you require a lot more frames since walking is a slow movement. Yours sorta seemed like a power walk.
Also, with the arms, I find that they naturally tend to swing with the opposite leg.
But yeah anyway, it was pretty good for a basic walk cycle and seemed like a great tutorial for beginner animators. You have the technique down pat, just need a little better execution. Practice makes perfect :P
Keep it up man.