Some new apps I have been using:
Too Loud: I don't know why I didn't get a decibel meter earlier. Great for health protection (how loud is your band room?) but I also see me putting this on the Apple TV to use during study hall or individual work time. Less me saying "It's too loud", I can just point to the screen.
Scribble Press: A super simple way for K-2 grades to write ebooks. Templates are set up with questions to answer. It basically writes itself.
Dr. Seuss Band: A pretty simple Guitar hero like app. For younger kids. You can make your own Dr. Seuss horn and it plays some pretty cool tunes. Great for rhythm development.
iMovie: Its fairly startling how easy this is to use. I made this video at Molly's Dance class. You can make professional looking videos right on the iPad with out using a computer. Really works smooth.
ShowYou: I like video and this app helps sort out the daily news.
OnLive Desktop: PC on the iPad. All the MS Office you can handle. Full versions of MW Word, Excel, etc... Amazing.