Toontastic is one of the most popular classroom app. If you don't already know about it then here is a chance to catch up. What can't you do with Toontastic?
Check this site out - I use "The Canadian Reader" (published 8 times a year) in my class & love it. My kids learn about current issues while using reading strategies.
jointed paper doll 3 001 by twopeasinapod123.com, via Flickr
Project iPad | Using iPads in 3 Primary Classrooms
Only 1 iPad in the Classroom? Great site with tons of iPad apps for the classroom (and ways you can use it even if you only have ONE iPad)
Displaying iPad Screen Using a Classroom Projector | Teaching With iPads | 21st Century Concepts-Technology in the Classroom | Scoop.it
Free apps for education list by Gary Toews, via Slideshare
Find educational apps from Apple's app store... http://www.apple.com/mac/app-store/
3 Excellent iPad Workflow Sheets for Teachers ~ Educational Technology and Mobile Learning