Through the Music 4 Education Blog, I found this posting from the TI:ME OMEA conference that was held in January of 2011. One of the sessions held there was about the various uses of an iPhone in the Music Classroom. I know at he AzMEA Conference in February, we had a similar session about the iPad in the music classroom. This link is for his slide presentation and handout.
When is an Phone not a Phone?