A nice idea, would have loved to have a mentor while I was coding my first Javascript mudball. Only problem I can see is clearly the human factor eg. there can be only one mentor mentoring one person at the time. (unless you're doing lectures of course) I think the biggest thing mentors can influence on is the culture of doing things and I myself have always been fascinated by the level of proficiency some older prog…
I agree with the mentality, way of thinking and approaching problems being one of the best things to learn from mentors. It's not something a blogpost on the latest tech can teach you.