its a possibility if anyone knows an apple wiz kid, they offer iphone software for "software developers"
personally as a newbie, i use my mac calender for all my appointments which can be entered as weekly/4 weekly etc, then when sync the iphone, hey presto its all there.
you can also put notes on calendar entries, so i put the price i charge each customer with each appointment i enter.
New 3.0 software update is due in the next few months.
Mr B