http://www.stuartburt.com/

Burt Stuart lists of apps (with App Store links) that teachers and students can use to enhance learning. Their are tons of apps out there, and I think the ones below are some of the better ones. These apps can be used in the classroom for specific goals and help the teacher teach concepts.
If you find an app that you like, email me at stuarteburt(at)gmail.com. Special thanks to @ipadsammy for helping me build the list below. If you aren’t following him on Twitter, you should because he is an incredible resource and would be an excellent addition to your PLN.

Teacher Tools

ShowMe – Personal Interactive Whiteboard – Record lessons, student work, and other interactions complete with audio!
Educreations – Similar to ShowMe
History: Maps of the World – High Resolution Historical Maps
Genius Scan – Turn you iOS device into a pocket scanner. Perfect for scanning documents, whiteboards, or student work.
Dropbox – If your not on Dropbox by now, you need to sign up now! Use this link to sign up. Save your stuff to the cloud and share with others.
Splashtop Whiteboard – Turn your iPad into an interactive whiteboard. Install this app and the companion app on your PC/Mac.

PK-2 Apps

Sight Words List – Simple, but customizable sight words. Teachers can create their own list and record with their voice.
Scribblepress – Story Creation and Sharing – Similar to Madlibs
Hungry Fish – Feed your fish and play with numbers
My Word Wall – Help children develop early reading skills
Duck Duck Moose Apps – They sell ten award winning apps for children that are perfect for teachers. Too many to list!
Tinkerbox – If you can imagine it, you can build it! This app teaches physics concepts in a fun way. Also available for iPhone/Touch.

3-6 Apps

Tinkerbox - If you can imagine it, you can build it! This app teaches physics concepts in a fun way. Also available for iPhone/Touch.
Flip It! – Create a flip book style animation. Great for fostering creativity in students.
What Was There – Similar to History Pin. Portable portal into the past.
Toontastic - Teach students about the story telling process and make a cartoon in the process
VidRhythm - A fun and fast way to create a music video. Teachers and students make the sounds.
MeeGenius - Kids Books that will read it to you and highlight the words as it reads. The student can also choose to read it themselves.

7-12 Apps

EasyBib – Get bibliography info on any book, magazine, or periodical. Users can scan the barcode and build a workscited. They also have a companion website.
Wolfram Alpha - Perform calculations, view graphs, generate reports. This app is a computation engine. Companion Website
Go Sky Watch - Planetarium and Sky gazing app. It will give extensive information about stars and other objects in space
Space Images – Stunning images of video of planets, stars, and other things that NASA has recorded
Stuck on Earth – The best places in the world to visit, photograph, and experience. Awesome images of the greatest places on the planet.
Khan Academy – Learn math and science concepts