How I Use It
Teachers can use Google Keep to create collaborative to-do or task lists that can be color-coded and crowd sourced/managed. Being able to organize and share notes would be a great way for teachers/students to ensure nothing is left out of a project. Google Keep can be used over a span of time to track workloads on projects as well. Having the chance to add an image to a list is a nice feature too. Set reminders for certain times or even locations (when using an Android-based mobile device) to make sure nothing is forgotten. Keep has many useful features and can be used in many ways.
I wouldn't necessarily call Keep a teaching tool, but it's a simple way to stay organized and/or track progress. Keep would be a great way to track the progress of small group work in a classroom without having to micromanage and create extra work for all involved. I think a tool like Wunderlist may be better if mobile devices or platforms that are not Chrome-based are going to be involved, but if you and your students are using the Chrome browser/operating system Keep is all you will need. It's very easy to learn and use, just like pretty much any other Google tool.