I'm doing job interviews and I take a picture of every business card I get handed. Evernote will OCR them and store them forever, so I can trash the cards and have access to the data in the future.

For flights, I store all my itinerary information, and also make a note of the parking location in a special note. Never forget that way.

I have a note for all my emergency contact information. I have a notebook for date ideas for my wife and I.