If you dont want to spend the money for MobileMe just to be able to sync contacts and calendars among various Macs and iPhones, you can get the same results for free using Google.

After installing various applications or services on your system, the computer may start these up at boot or login. OS X supports a number of different ways to automatically launch applications and services, some of which are a little more obscure than others and may result in applications launching even though they are not in obvious startup items locations.