Keychains can also be used to store confidential information that does not belong to a specific
application, such as bank, credit card or confidential personal information in the form of a Secure note
item. These can be added to existing keychains from the File -> New Secure Note Item. It is
recommended that secure notes be added to a separate keychain that does not share the same
password as the login keychain. This ensures that should the confidentiality of the login password be
compromised, the secure note will remain secure.
To create a new keychain and add a secure note, choose File -> New Keychain, once a name and
password have been chosen, select the keychain and choose File -> New Secure Note Item:
For myself I use
EDIT: You can also create an encrypted folder for sensitive documents
I second the recommendation for 1Password. I've used it for a couple of years now on both my Macs and my iPad and have been very, very satisfied with it.