The migration assistant provides a step-by-step utility that walks through getting your contacts, calendar and phone camera photos from your Palm, Windows Mobile or BlackBerrry devices onto your Mac and then into your iPhone.
MissingSync will also provide SMS, Call Log and Note syncing for the iPhone. The iPhone's SMS, Call Logs and Notes are not currently synced with iTunes.
The application will not be available until Q4 2007. They also offer Mac syncing solutions for Windows Mobile, Palm OS and BlackBerry.