Since retiring, I'm looking at ways to share my skills with others. I was a Human Resources Director in the High Tech arena until last May.

Does anyone know of organizations which could use such skills?

There is an organization called SCORE: Service Corps of Retired Executives.
A nonprofit association dedicated to encouraging the formation, growth, and success of small business nationwide through counseling and mentor programs.
Check out their website at www.score.org (http://www.score.org)
This might be just the thing you are looking for.