Outside of work? Not anything formal.

I offer mentoring as a consulting service. It's often a followup of some longer training. It's lots of fun when it happens. We usually talk once or twice a week and discuss "the problem of the moment". Contracts like this usually last 3-6 months, and I probably do one every couple of years.

There isn't a huge demand for this sort of 'one-on-one' training since most programmers with moderate experience can "Google until it works"