Thanks to Theresa Wilson for passing this article along to me. There are some fantastic rubrics here to evaluate educational apps for mobile devices based on relevance to the curriculum, ability to customize, level of student feedback, encouragement of thinking skills, level of engagement, and performance sharing.
Also included in the article are other app evaluation tools from around the country. If you are using the iPad, iPod or other app-driven mobile devices in your classroom, this is certainly worth a look.