I may or may not get to these in the future. If you do before me, please let me know.
Single-use P2 threads. P2 is an awesome theme for threaded conversations that stand the test of time. Avoid long, drawn out email discussions with friends by pointing everyone to a P2 thread.
A year ago you wrote… Emails of what you wrote in the past, a la Timehop.
Lock one or more dashboard widgets in place for everyone. The WordPress dashboard offers infinite customization. Sometimes you want to make sure a widget (e.g. site announcements) appears in the same place for everyone though.
Save Manage Posts filter state. It resets your query argument filters every time you navigate away.