Now that the iPads are now almost all out I thought it would be a good idea to give you a list of some apps that could be usefull if you are choosing to use them in your classrooms. All of the descriptions have come from iTunes. I wont post pricing as it may change at anytime.
--------------
Alphabet Fun  Learning the A-B-Cs was never like this. Alphabet Fun makes the most of   Multi-Touch technology on iPad to teach kids letters, numbers, and   colors. They’ll swipe through colorful images and easy-to-read text.   They’ll trace over letters with their fingers right on the iPad display.   They’ll even write entire words. Kids think it’s a game. Parents think   it’s educational. Everybody wins.
Math Magic  - Don’t you just love how much your child has improved in adding,   subtracting, multiplying and dividing? You never get tired of hearing,   “Can I do math?” from your six year old, do you? Of course you don’t.
Star Walk  is a winner of APPLE DESIGN AWARDS 2010 for technical excellence,   innovation, superior technology adoption, high performance, and   outstanding design! Star Walk is installed for demonstration on iPads at   Apple Stores! Try it out in the shops! Enjoy NEW Picture of the Day  and  Bookmarks sections, share your astronomy observations via Facebook  and  Twitter! iPhone best astronomy app *Featured by Apple - Best Apps  of  2009!* is now available for iPad! On a bigger screen starry night  sky  looks fantastic with 3D graphics and one of the user-friendliest   interfaces ever. Star Walk is your personal planetarium that can answer   to all your curiosities about the sky! For anyone who is interested in   stargazing, amateurs or professionals Star Walk makes discovering more   than 9,000 stars, planets, constellations, messiers as beautiful and   easy as it has never been before!
National Geographic's World Atlas HD  - Designed specifically for the iPad, National Geographic's World Atlas   HD puts our best maps in the palm of your hand. Unlike other map   applications, the National Geographic World Atlas HD utilizes our   highest resolution, press-ready images, providing you the same rich   detail, accuracy, and artistic beauty found in our award-winning wall   maps and bound atlases. The app is preloaded with 3 different styles of   world maps, down to country-level detail. With an internet connection,   you can continue zooming through continent-level maps to detailed Bing   maps - close enough to see your home!
Dictionary.com and Thesaurus.com  - The free Dictionary.com app delivers trusted reference content from   Dictionary.com and Thesaurus.com, including nearly 1,000,000 words and   definitions and 90,000 synonyms and antonyms. No Internet connection is   needed. The app also features audio pronunciations, similarly spelled   words and Dictionary.com’s popular Word of the Day that is enjoyed by   millions of people.
Wikipanion  - Accessing Wikipedia has never been faster and easier than with   Wikipanion, designed for easy, search, navigation and display of   Wikipedia entries. Streamline your browsing with history grouped by   visit date, and bookmarking that not only bookmarks individual entries,   but individual sections within an entry.
Miss Spell’s Class  is an original word game that lets players test their spelling skills   against the most commonly misspelled words on Dictionary.com. Players   must quickly decide whether each of 20 words is spelled correctly or   incorrectly, as speed and accuracy count to get to the top of the class!
ArithmeTick  - How fast can you add and multiply? Solve math problems against the   clock! ArithmeTick is a challenging math game where you solve addition,   subtraction, multiplication and division problems! The objective in   ArithmeTick is to solve as many problems as possible before time runs   out. You are awarded up to 10 points and additional time for each   correct answer. A practice mode is also included to help sharpen your   math skills! With five difficulty levels, ArithmeTick is perfect for   kids and adults!
Read Me Stories  - A new talking picture book EVERY DAY teaches your child new concepts,   new words and how to say them. Your child can practice reading -   anywhere, anytime - while you’re driving, shopping in the grocery store,   or having a quick coffee at your favorite cafe. Our books are fun and   entertaining - so your child will look forward to reading their new   book, every day! Imagine that - your child reading a new book everyday!   You can spend quality time with your child while teaching them the core   skills of reading and speaking that are so necessary for every child  in  today’s modern world. Bedtime reading will become something   extra-special. Or, you can have a break while your child practices   reading. With our books in your pocket, that can be when and where it   fits into your day.
VideoScience  - Science Class Experiments brought to you by Science House and   featuring Science Teacher Dan Menelly, winner of the NSF Einstein   Fellowship in Cyberinfrastructure! These videos are 2 to 3 minutes in   length and demonstrate the steps of simple science experiments. The   experiments are designed to inspire and excite kids of all ages, with   very little set-up time and using only low cost materials. So whether   you are a public school teacher, private school teacher, or home school   teacher; we hope you use these videos and the many more on our website   to ignite the scientific passion in your kids.
MobileTeacher - an  application that complements the Mathletics web site. Mathletics is used  by more than 7000 schools worldwide and allows teachers to customize  tutorials and guidance according to the progress and skill of individual  students. The product takes away much of the administration of teaching  and with the iPad application now available, teachers can monitor and  update progress in real-time.