Keep looks like a pretty full featured note-taking app that allows you to "save ideas and organize to-dos the moment they happen by creating notes, lists, photos and voice recordings right from your phone" or tablet or PC. The app will also be integrated into Google Drive "in the coming weeks." Voice notes will be transcribed, and notes will sync across devices.
The app looks pretty slick. We'll be playing with it to see how it works. If you want to give it a try, it's available on the web and in the Play Store for free.