Planbook is designed to manage a teacher's lesson plan book. In addition to the traditional functions of a plan book, this software allows you to link documents to your lessons (a word document describing a lab, for example), search your plan book, and export your plan book to HTML or directly to an FTP or MobileMe server. 2.0 also allows you to track standards, units, and tag lessons with keywords for advanced reporting.
Check out the Yahoo Group: Planbook for a mailing list and more information.