Yes, I think the most important practice, dovetailing with what you've already said, is to create a formal mentorship program that is both well supported and well advertised. By that I mean one that's legitimated by senior people in organizations, so that it's just part and parcel of everyday work and not seen as something odd or special, or as somehow that, “I must be inadequate because I need a mentor”. It should be the accepted way of doing work, so that mentorship is part and parcel of everyday work.
On November 6th, 2014. See this statement in context.