The International Society for Technology in Education (ISTE) site on professional development. There are many resources here including webinars on 21st century skills and using tools like Twitter or iPads.

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The International Society for Technology in Education (ISTE) site on professional development. There are many resources here including webinars on 21st century skills and using tools like Twitter or iPads.
Information on the TPCK model and how it can change the way instructional technology is utilized in educational settings.
Abstract: Few teachers have used spreadsheets as tools for learning mathematics, leaving many of them unprepared to guide students in learning mathematics with spreadsheets. Current teachers have not had any preparation that develops technology pedagogical content knowledge (TPCK) - the intersection of the knowledge of mathematics with the knowledge of technology (spreadsheets) and with the knowledge of teaching and learning. This professional development program focused on guiding teachers in developing TPCK for teaching mathematics with spreadsheets. Actual teaching opportunities were extended by classroom observations and support as teachers implemented their developing ideas. Research results revealed potential key attributes of a TPCK professional development program along with a preliminary model for describing the developmental progress of the inservice teachers in their growth in TPCK.
5 TED Talk videos listed and described in a blog post on ISTE's website.
Links to videos of TED Talks that cover important topics like success, creative, and instructional technology in educational context with speakers like Bill Gates and Sir Ken Robinson.
These videos get teachers thinking about important issues in education. Though the title suggests they are slightly dated, there is still relevant and interesting information there.
The national standards for learning foreign languages.
These are important for understanding how to plan and develop lessons on learning a foreign language.
Great article about how teachers are getting videos from all over the place on the internet. I get most of my videos from YouTube because it is unblocked for teachers at our school and contains a wealth of videos, where do you get yours?
I would add Khan Academy to those mentioned.