The Moving Forward Wiki is devoted to Teacher Development. It has pages for lesson plans, twenty-first century skills, links to resources, and a wealth of great links to other educational organizations.
A guide for helping teachers choose Web 2.0 resources to fit their needs. The site is searchable through subject and grade level to find teh perfect free tools necessary for your lesson.
A site funded by an educational endowment from Verizon, this website has some good professional development articles about how to adapt news into lessonplans, tips on creative lessons and twenty-first century skills, and a database of lesson plans searchable by subject ans age.
Blog of Educational Psychologist and former English Teacher, Damien Barexica, who is very involved in integrating technology into the classroom, and in his own words, "Making the Technology fit the lesson and not the other way around."