I was in the Entrepreneurs Organization (http://www.eonetwork.org/) for a few years, and the organization had a required protocol for advice sharing called 'Gestault Protocol', loosely derived from principles in Gestault Therapy (http://en.wikipedia.org/wiki/Gestalt_therapy#Overview). Effectively, the protocol prohibited you from sharing opinions as advice, and forced the sharing of specific experiences through personal stories.

This protocol becomes very useful in situations where other people have been down the same road as you - things like business processes, development processes, hiring, dealing with employees, raising money, investing money, etc. However, it also provides a nice boundary for giving advice - only share experiences, never share opinions. So, when I'm asked for advice, I listen careful, and try to see if I have any relevant experiences to share, or I try to think of who might be better suited to share experiences.

Further, when I am asking for advice, and someone lends an opinion that seems interesting, I ask pointed questions about this persons experience to determine how I will weight the input, and whether the experience indeed does apply to my situation. So overall, I've found experience sharing to be a relevant boundary for giving and receiving advice.