User History Log Block
Displays a list of some changes made to a user's record, who made them, and when.
- It does not show every "change to a user record" as your average human would think of it.
- Recommended placement is behind a tab on the user profile and/or an auxiliary form.
- Logs are eventually removed, so you can only go back so far in history.
Pretty Picture
Screenshot of part of the history log on an example case:

Configuration Options
- Default Changes Filter - a textbox for, well, the default text you want to filter on