Here are some things that I have been using daily in class (or out):
Safari - the default web browser is PERFECTLY set up for my needs when I am checking in the students weekly blog posts. I use another browser for my personal web browsing, but for class, Safari works great.
Blogger- This is the google issued blog writing app for the iOS platform. It is barebones, but functional.
Blogsy - a $4.99 blogging app that allows for much more creativity in posts -- bold, italic, colored text, strikethrough, etc. Not necessary for general use, but fun for me.
first-class- The app is so helpful for communication! I love it!
HT Recorder -- this app is AMAZING. And free! (Although I couldn't find the FREE app when I was searching for the link. Very strange.) I record the band playing songs, and then when I work with the small group that was not able to fit it in the schedule, they can play along with the recording! Also useful for interpretation and analysis - did we achieve the musical style goals we had set?
ProTuner - another free app that is incredibly useful for a musician. It is a tuner! We used to spend $30 - 40 on a quality tuner, and now they are available as free apps. Unbelievable!
Tap Metronome - another incredible free app that replaces devices that would range in cost from $10 - 25. This app helps set the tempo (speed) that you wish to play, in a variety of different ways. Very useful for any musician.
There you have it- a basic list of the ways that I am using the iPad already in classes, and the apps that I use.
Again - this blog post created using the Blogger app, but edited at the website on my MacBook.