Reviewing daily habits. The tools used. The files accessed or modified. The contents of the working directory should be sorted by their time of last modification.
Timing work. How long does the system take to process the commands ? How fast do you type ? On what day does this date fall ?
Reminding oneself. Pinpointedly keeping short lists of key objectives. Obediently leaving when it's time to leave aside. Diligently e-mailing onself.
Automating repetitive chores. A launcher to open applications with few keystrokes. A transient backup routine. Intelligent folders. Scripts.