From original post by Technology Tidbits: Thoughts of a Cyber Hero
The Teacher Professional Development Sourcebook is a great resource for teachers and administrators. It is published twice annually, for free, and contains a huge amount of resources.
Each issue includes articles, news, tips, ideas, research, resources, a calendar of professional development activities and more, all about professional development and continuing education. The back of the sourcebook is a type of yellow pages (even though they are white) with a directory of products, services, resources, and more related to professional development and continuing education. The directory is organized by type, topic, and subject area.