I just ran across this video on youtube showing the authors top 10 hidden features and thought this would be a good time to start a thread where you expert Notephiles posted your top tips and tricks that others might not know about. I personally love android but often find it hard to find some of the hidden gems that are buried a few layers down in the OS. I have a feeling that the Note might have even more features because it is such a powerhouse.
https://www.youtube.com/watch?v=a_g9gAZd6zw&feature=em-subs_digest-vrecs
I'll start with a fun one from the above video.
If your not one to use the power saving mode very often you can tweak it so that it turn your phone greyscale only. Pull down the quick launch> long press power saving mode for its settings> and turn off all the power saving features minus the grayscale option. This will still save battery but not hamstring your phone at all!
edit: typos