Actually, the "notes" section of Address Book does indeed sync over to iPhone...that's where, in Address Book, I've meticulously entered all the business hours of the various stores and restaurants I've got in Address Book/iPhone.
That way, I can tell at a glance, on my phone, how late a particular restaurant or bookstore is open, if I happen to be in the area at night or whatever. I use this all the time, and it's a very nice tidbit of info to have, literally, at your fingertip.
So you should be able to put that stuff into Address Book, in the notes field, and it'll come right over to your iPhone!
Do a quick test to confirm, if you're curious...type something in the notes field of one of your Address Book entries and sync your phone...
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