• Established a useful new habit
• Obtained new evidence that made you change your mind about some belief
• Decided to behave in a different way in some set of situations
• Optimized some part of a common routine or cached behavior
• Consciously changed your emotions or affect with respect to something
• Consciously pursued new valuable information about something that could make a big difference in your life
• Learned something new about your beliefs, behavior, or life that surprised you
• Tried doing any of the above and failed

Or anything else interesting which you want to share, so that other people can think about it, and perhaps be inspired to take action themselves.  Try to include enough details so that everyone can use each other's experiences to learn about what tends to work out, and what doesn't tend to work out.

Thanks to everyone who contributes!

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