An easy way to sync just the Address Book and iCal with the iPhone is to use iSync. Although the iSync application doesn't recognize the iPhone, you can sync with the iSync menu in the menu bar. Make sure the iPhone is connected with a USB cable to the Macintosh, and then choose Sync Now from the drop-down menu under the iSync icon in the menu bar.

[robg adds: Obviously, this will work best as a time saver if you have your phone set to manually sync in iTunes.]