A fellow ADE recommended this app, which is actually two. The iPad app is iBrainstorm and the iPhone/iPod touch app is iBrainstorm Companion. iBrainstorm is a set of collaboration tools for sharing and collecting notes. The iPad serves as a canvas for colored sticky notes and freehand drawings. Up to four handheld iDevices can create and flick notes to the the iPad’s digital, dynamic cork board. Works best on a local Wi-Fi network though Bluetooth is an option. More about these apps here as well as a demo video.