I am launching today a new FirefoxOS app: dictaphone.js. This application implements a digital dictaphone and relies on the WebAudio and IndexedDB APIs. It fills a need of my own as I missed such an own on my own Geeksphone Peak phone and could not find something suitable on the Firefox Marketplace.
The app has its own dedicated website: http://www.fos-apps.org.
The project is completely open source and can be contributed to or reviewed on Github: http://github.com/laaglu/dictaphone.js.
The app is also distributed through the Firefox Marketplace.
The app also works on desktop browers (Firefox and Webkit-based browsers) but not on IE (which does not support the WebAudio API).