You are not the only one asking for this kind of functionality. We are investigating the various options, but there are no official plans I can share at this time. That being said, the way we would most likely implement it is to sync Lotus Notes Contacts and Calendar with the native applications (Address Book and iCal). From there Apple's own software can sync with Mobile Me, iPhone, iPod, etc.
Thank you for your suggestion.
Feedback response number SHET7N4M57 created by Simon Hewett on 01/08/2009