1. Take 5 - @daveguymon makes an awesome 5 minute PD-packed podcast daily! One of my recent favorites is Episode 36: Getting Your Colleagues To Tweet With You.
2. EduSlam - @HollyEdTechDiva and @edtechschools collaborate with a special guest to discuss best practices using technology in the classroom. One of the best eduslams I have seen was a poignant discussion of Reframing the Student Blog with @davidtedu.
3. TeacherCast - Jeff Bradbury aka @teachercast has loads of resources with other teachers, including the 100th Episode with @jedipadmaster discussing Parents, Students & Autism.
4. Techlandia - @ipadsammy, @curtrees & @tedrosececi collaborate together with a guest to discuss 3 great apps, 3 people to follow on twitter and other delights. Find all their podcasts here.
So there you go. Take 5 minutes or an hour and listen to the latest from some great educators!