Texas Instruments, makers of very popular graphing calculators, offers an extensive series of professional development programs. One such program is a series of free webinars about using their NSpire Math and Science Graphing Calculator products in the classroom.
Thanks to Tech Learning for the link to these webinars.
Applications for Education
If your school is using the NSpire Math and Science Graphing Calculatorproducts these webinars may provide you with some new ideas for teaching Algebra and Geometry.