Apple KBase Article: Resetting your keychain in OS X
Resetting your keychain in Mac OS X 10.3, 10.4
If Keychain First Aid finds an issue that it cannot repair, or if you do not know your keychain password, you may need to reset your keychain. (Resetting a keychain deletes a keychain reference while preserving the keychain file.)
Here’s a good Apple Knowledge Base article about resetting your login keychain to keep on hand in your browser favorites. The only thing I would add to it, which isn’t made clear; resetting your keychain in this manner will rename your old keychain to “login_renamed#.keychain” (where # is a number), which can be opened manually in Keychain Access again to copy digital certificates and other passwords to the new login.keychain — this is presuming, of course, that your old keychain is not so corrupt that it can’t be opened.
Another "Limited" Zero-Day Vulnerability
Microsoft posted a Security Advisory (932553) about a new “limited” zero-day security hole in Excel today. The advisory goes on to warn that other Office apps could be at risk as well.
I’d suggest you check it out if you’re a heavy (or even moderate) MSO user.
