Knowtes is a great app for students to use when conducting research online. Check out the post here.
Pearl Trees - Great way to organize and save your websites. Check out the post on this here.
2Screen - Great for projecting almost anything (except other apps) from your ipad.
iCard Sort - An app that can be used to create word sorts and concepts sorts. Free for a few lists, upgrades available.
Sling Note - Check out this post here for more information. Great educational potential!!