Portable prayer list
Use out-of-date business cards or post-it notes to maintain a portable prayer list.
Write a name or topic on each one, fasten the pack with a rubber band, and keep it in your pocket. When walking, waiting, or using public transport, work your way through as many cards as you have time for. The pack will grow over time as you add new people and topics. To keep it manageable, put an "expiry date" on some or all of the cards (you can always add them back in later). To pray for colleagues at work, get a copy of the organisation chart for your team, cut out the boxes with people's names and job titles, and stick them to the cards (clear sticky tape works better than glue).