I love great content on iTunes U. Florida Dept. of Ed is one of those content creators on iTunes U I highly recommend people take a look at on iTunes (or iTunes U on their iPad/iPod Touch/iPhone.
Here is the link: http://itunes.apple.com/us/institution/florida-department-education/id399604477
Be sure to check out the Digital Tools section, there are some great video podcasts demonstrating student use of technology to reinforce a lesson.
And here is a little video of theirs from YouTube.