I am finding my .Mac account has some serious features that are keeping me happy with the syncing going on with my iPhone. I use a MacBook Pro for work ... it has my bookmarks, calendars, and contacts dialed in on it. I keep all my media on an iMac in my home office ... I haven't tried syncing between two machines, but the .Mac sync features allows me to easily keep my laptop and desktop in step with one another. I sync the iPhone and my iPod on the iMac, so having a way to easily move the right calendar, contacts, and bookmarks via .Mac is proving very effective.