1. One Touch Reveal (Free - Universal) - One Touch Reveal is a blood glucose monitoring system that works in conjunction with the One Touch Vario Sync testing meter. Glucose results are synchronized from the Vario to the iOS App via Bluetooth. The application maintains log book, shows your average Glucose numbers over a 14 day period, and allows for simple reporting of the aforementioned metrics. The app also allows for the entry of medicine (various insulin types), carbs, and a way to manually enter a glucose test if using another type of meter. This app has been invaluable in assisting me with managing my Diabetes. I would highly suggest taking a look at the One Touch Vario and the Reveal app if you have an iOS device.
2. MagiCam ($0.99 - iPhone) What can I say? This app is truly magic. From the makers of the wildly popular iOS camera app Camera+, TapTapTap has yet another winner on their hands. MagiCam is a simple camera app that applies image correction on-the-fly to make your pictures look outstanding each and every time. There are a limited number of post-pic filters that can be applied if necessary. Overall, the quality of the pictures is usually outstanding. MagiCam integrates with the standard iOS camera roll which makes things so convenient in terms of keeping all your photos in one place. I have take some really nice shots with MagiCam and it has earned a place on my main home screen. For .99, you should definitely give it a shot (no pun intended).
iPad
1. Notes Plus ($3.99 - iPad) - A full-featured note taking app for the iPad. Support for the Adonit BT Touch/Script has been added only for the iPad 3 and later. The app offers a very clean UI and offers sync with Dropbox. Handwriting recognition is offered via an in-app purchase. Overall, Notes Plus has become my default handwriting note app on my iPad.