I have recently discovered an app called ";Tempo2";

http://www.frozenape.com/Tempo2/Tempo2.html

Tempo 1 was awesome (basically a Korg MA-30) But tempo 2 is like having a mini Dr. Beat in your pocket!!! I'm doing a video review of it to put on my website soon. But for now you can look at the tutorial video on their site (their examples are a bit far from practical, but it does show the features)

Plus if you have students they can buy it for 3 bucks, waaaaay cheaper than buying an actual met!

I love that app!!

Rock on baby!

Sold. Thanks for the pick perpetualpoet!

Thumb Jam. . . I LOVE THIS APP!

pretty cool...thanks for sharing.

SOLD...bought it myself...

Here is a new one for your enjoyment.
http://itunes.apple.com/us/app/drumline/id357815924?mt=8

Wow Thumbjam is now number 2 for me! It's the first music app I've used that I can acctually make REAL music with!!! And the sounds are incredible!!!!

I was on a feild trip to MT. Vernon with my kids a couple days ago and we had hours of fun looping stuff!!!!

I've been using this year to teach my kids Modes, Scales and Improve. :) It also works really well for practice loops.