I know I frequently reference Story Kit on this blog. However, I thought it would be worthy of your time to see how flexible apps on the iPod Touch or iPad really are.
I am posting an example of how first graders were recording their science experiments with a worm bin. Mrs. Munk from the Kendallville Public Library provided Mrs. Yoder from Avilla with a worm bin. To record their observations, they took a picture within Story Kit. After they took their picture, a sentence was written to describe the picture. (You could also rely on audio recordings.)
Overall, I thought it was an excellent idea.
Checkout this example: