For Park & Grabs, a Rite in the Rain pen, small maglite, and my Samsung Galaxy 3.
For the "get out and get moving" types, I have a mirror on an telescopic pole that has an LED on it. A small notepad, a Gerber multitool, some swag to trade. Keep it in a Maxpedition FR-1, and I'm sure that thing will bet loaded up with more stuff over time.