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Here's how one teacher uses Evernote to organize her lessons and resources:
Another thought:
As a teacher, do you archive the notes your write on your whiteboard?
Evernote allows you to search text in the photos you save. So take a picture of your whiteboard, save it in Evernote (organize however you organize), and then when a student says, "I missed the notes about cells," you can look up key words you wrote on the whiteboard, and pass on the notes you wrote on the board. Or you can reference them the following year when you're ready to teach this subject again.
Evernote can also be used as a student portfolio that can be shared with the students and students' parents:
Since Evernote is free, give it a try and let me know how you use it in your classroom!