To sync contacts with your computer, choose "Sync Contacts with" within iTunes for Windows, or "Sync Address Book Contacts" on your Mac.
My iTunes - iPhone - Summary:
Options:
checked: Automatically sync when this iPhone is connected
checked: Sync with this phone over Wi-Fi
Info:
Your contacts are being synced with your iPhone over the air from iCloud
Over-the-air sync settings can be changed on your iPhone
No "Sync Address Book Contacts" on MY Mac
Address book preferences
Accounts - On My Mac local
Checked: sync with Google (it works)
Unchecked: sync with MobileMe
Unchecked: syn with Yahoo
Last week I created a group on my iMac Address book
I don´t know how but some days later it appeared in my iPhone (and in www.icloud.com)
Two days ago I created a new group with new contacts there's no way to sync to the iPhone (I guess iPhone sends data to iCloud, 10.6 cannot connect to iCloud - I saw some tricks to get that that remember me the MS Windows enviroment)
I'm asking myself what did people do in 2010, syncing a 2010 iPhone using a 2009 OS. Cannot be that complicated.
Thank you.