I don't like doing notes on the phone. I prefer written. IMO, it is easier to review later and keep up with. Each to his own I guess.
Certainly to each their own, but those are the exact reasons I take notes on the phone. I can dictate (or swype) a quick note or list, save it. Tie it to a calendar event, with a reminder in advance if I want. I can include hyperlinks on the note that work, send them to other folks in the event, receive updated shopping lists while I'm at the store, and the wife finds one more thing she needs.
Honestly the tying to meetings in my calendar is the best. Jot a note, take a picture (That I can write notes on i.e. THIS is what the meeting is about) tie it to an event, and it'll go out with the invites so everyone at the meeting is tracking. Then tell it to remind me 24hrs (or whatever) out so that I can review it.
The wife has worked on geotagged notes, so she can send me shopping lists in the morning, and the phone will ding as I'm passing the grocery store that evening on the way home, and I can grab what we need.
Written notes in my life are always exactly not where I need them to be, and usually in the pile of stickys stuck to my monitor.