http://keep.google.com is a Google product for digital sticky notes. In particular this is an app for tablet devices that also syncs to the web so students can access their notes from anywhere.
What is nice about the Google Keep app is first the interface is very clean and easy to use. Create a new note and choose a color. The note can be typed, a picture or a voice recording directly into the app. Quick and simple is the name of the game. In particular the voice recognition on my Nexus tablet is nearly perfect, thus making it easier to voice dictate my ideas rather than type with my thumbs.