[rattlsnak]

Im using MobileMe, which is actually an additional $99.00 a year, but it automatically syncs all my contacts, over my phone and multiple computers. You can also set it up to do pictures, files, etc.

i.e. If I add a contact to my phone, it will populate on my computer(s) without hooking any cables up or performing a manual sync. Same thing the other way. I can type in a contact into my computer and 10 seconds later it is stored on my phone.