The following are links to use iPods and iPads in the classroom:
iPads in the classroom: Prepared for the teachers - do's and don'ts and some great sites.
iPad apps document
iPod apps for K-12 teachers
Teach with the iPad
iPads in the classroom Live Binders
iPads for Education
Escondido Union School District: Over 100 iPod apps
Apps in Education
Elementary School Apps from Palm Beach Schools
Middle School Apps from Palm Beach Schools
High School Apps from Palm Beach Schools
Various School Districts using iPads
Great Site from the UK: iPads in Education
iPad School Wiki: Contains several apps, not just for the core curricular areas but also music and creativity.
Apple in Education: Apps