Naomi Karten is a wonderful author, speaker and consultant for organizations trying to improve their customer service. Among her specialties are creation of effective service level agreements.
Roger von Oech has written a variety of books about problem solving and creative thinking.
Edward de Bono is one of the few authors to explore tactics for problem solving.
Home page for the Sacramento Valley Chapter of PMI. Great resource for project managers looking for networking & professional development opportunities.
The Project Management Institute is a professional organization for Project Managers. If you manage projects for a living, a good source of networking might be the PMI chapter near you.
Dorset House is a niche publishing house that focuses on software engineering, commercial software development, and project management topics.