I made some music
I've had the new iPhone 3G for about a week now. I'm loving it so far. I've had a few of the windows mobile phones in the past and they aren't even close to the usability of the iPhone. Once I got comfortable with all the e-mail and web browsing I tried a few of the apps in the app store.
The one that has been the most captivating for me so far is BeatMaker by Intua. I've wanted to experiment with drum machines for quite awhile but hadn't gotten around to it yet. This application really shows the power of the iPhone more than I had seen before. You have a full 16 pad drum machine with unlimited multi pattern/multi layer capabilities. For a first generation app is it is very solid. I am impressed with the amount of features and stability. You can load and save drum kits, make your own kits and load your own samples. You can upload your files wirelessly to your computer as well. The interface was intuitive and I was able to figure it out on my own with trial and error. I later read the manual which was also quite thorough. This application is definitely worth the $19.99 in the app store.
So far I have primarily used the included drum kits. I hope to experiment with making my own samples soon. Ideally I'd like to be able to record sounds and process them on the fly in the phone and add them to beats as well. However, the way you can already cut and modify samples within BeatMaker is above my expectations for what an iPhone app could do. Some of these were made while sitting on a park bench, standing in the subway and wherever else I was and had the inspiration to make a song. I was able to make these anywhere from 20 minutes to a few hours for ones I wanted to keep tinkering with.