Changing priorities isn’t a problem: just open Keep on your Android phone or tablet (there’s a widget so you can have Keep front and center all the time) and drag your notes around to reflect what matters. You can choose the color for each note too.
Pro tip: for adding thoughts quickly without unlocking your device there's a lock screen widget (on devices running Android 4.2+).
Google Keep is available on Google Play for devices running Android 4.0, Ice Cream Sandwich and above. You can access, edit and create new notes on the web at http://drive.google.com/keep and in the coming weeks you'll be able to do the same directly from Google Drive.