And what would we do without the trusty waterproof ziplock baggie for swim workouts?!
That's not to say that I don't utilize technology too. I take full advantage of the programmable workout feature of my Garmin devices, but for anything complicated, the supplemental Sharpie is warranted. I like the combination of the high-level "arm view" and the more detailed "technology view".
I've seen cue sheets zip-locked and taped to aerobars, notes on sports tape on bike frames, and inspirational messages written on water bottles.
Are there other good techniques I have missed?