Apple unveiled three new iPod touch models during its “Let’s Rock” event, all of which are available today. For $229 you can receive 8GB of storage, for $299 you’ll get 16GB, and $399 scores 32GB. That’s knocking $70 to $100 off the price of each.

The new touch body is very slightly thinner, and has a similar tapered back as the iPhone 3G. It will also include an exterior volume control and a built-in speaker for “casual listening.” There is no microphone built in, but the touch will work with new Apple headphones that include a microphone on the cord. This new feature could prove handy for teaching and learning. I can foresee students and teachers creating and sharing educational podcasts, playing and recording lecture notes, etc. from the palm of their hands.

For more details, check out iPhone Atlas’ coverage of the “Let’s Rock” event.