Meredith Bell's most recent article offers great advice for becoming more approachable. Engage people in a topic they care deeply about by asking great "passion-finding" questions to get the conversation flowing naturally. Then listen carefully so you can ask follow up questions to discover what matters most to them.
Read Are You Approachable?
For those looking to boost their listening skills, I recommend the Personal Listening Profile, an online assessment that helps you learn to listen and respond with purpose.
The DiSC Experts at Resources Unlimited