Try and avoid stupid people.
Have you succeeded? I find it to be impossible.
A friend of mine was venting and saying that his #$#%^ wife made him mad. Another friend asked him why not leave her ?
He replied :
Because ... her twisted brain made life like hell, an the rest of her made my life like heaven.
You win some and lose some.
And that makes decision-making very hard.
Back to "sanity" kit
Seems to me that multitools are more versatile and helpful than knives in urban setups, and they do not carry with them any negative baggage.
I havent seen much use for electronic organizers like PDAs or Blackberry's. I seem to favor the pen and paper for listing stuff.
Updated contact lists are typed on the word processor and a hard copy thrown in every bag and every table drawer I have ( home, office ). It helps for the days when a bag is forgotten in the rush.