Practice Skydive Altimeter for iPhone (altitude awareness)
At the risk of being labelled a geek (oh well) I admit during AFF I knocked up a practice skydiving altimeter (not a real altimeter) for the iPhone. I lost altitude awareness on AFF stage 3 and was really nervous for the next jump. So I knocked this up to practice with. I think it did kind of help, going through the dives & remembering to look/read the alti, but with hands that were moving/mimic'ing the actual dive.
This won't of use to anyone beyond AFF/AFP, but during these first 9 jumps this might be of use. Anyway had some fun learning how to put it up on the app store.