I've been search for /the best/ note app for years. Evernote, Catch Notes, and the built-in Notes app have all failed me. Simplenote is the best app I've found for the task. - On a mobile device, it's one click from opening the app to writing notes - Syncs between mobile, the web, and the desktop app - Has an Emacs package (!!) - Has an API - Syncs with Dropbox I love it!