I've wanted to do this for a long time. I picked up a Zoom iQ5 Audio Recorder for my iPhone from Amazon this week. I'm extremely happy with it so far. I can record a clip in the middle of or between lessons very easily, with good quality and upload from the phone straight to Soundcloud. From there it's a piece of cake to embed the code on the site here. I plan on having the First Getchell Book finished in a day or two and the Second Book finished next week.
There are plenty of resources for professionals and older students looking for study recordings but not so much for beginners and very young players. I plan on making a small dent in that with Simple Trumpet.
This playlist is now complete. You'll find all 64 ´etudes from the first book below.
I highly recommend to Zoom iQ5. It's Awesome.