Info About Google Contacts
Google Contact is modified version of Google Contact Manager which was already present in Gmail.
In Google Contact you can store basic information like name , Phone No., Photo to whome you chat or mail. Google contact manager already store mail ID to whome you chat or mail even though single time as well.Google contact manager offer three category Family, Friends and co- Worker to manage contact in better way.
if you have lots of contact but Google contact wouldn't confused you because it offers search option within your contact list. Google contact would be very useful for you in the case you lose your diary or cell Phone , it would work for you as a contactbeck up.
Try Google Contact
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www.google.com/contacts