Check out this blog

I stumbled across this blog and think it's definitely worth looking at...

If you go to that blog, maintained by Dr. Ruben R. Puentedura, and click on any of the podcast links, like this one, it will (hopefully, if you have it installed) open iTunes and you'll see a list of all of his podcasts. They are amazing! Very detailed and somewhat technical, but worthwhile checking out if you're already quite familiar with the topic and are interested in taking it to the next level.