Security: Mail, "macdotcom", and iChat requests password frequently...

I login as the main user of my laptop and lately Mail, something called 'macdotcom' and iChat requests password access to Keychain. I type in my password but realize that this is a new behavior (have not upgraded lately) and wondering whether this is a virus or trojan horse program?
Why would I need to provide a password when I've already authenticated as the administrator of the computer?
Is this normal? or should I be worried about a trojan horse? How can I check?

So the whole system is essentially becoming unstable. Any help on how to track down the culprit would be appreciated. Thanks!
Bhavesh

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