Steganos LockNote is the one of the simplest application to store/retrieve confidential data. If you want to store E-Mail account passwords, bank login details etc in a secure way, LockNote is the application to use.
It is also very secure since the information is encrypted using a password and it uses AES 256bit encryption.
There is no installation required and you can easily encrypt existing notes/documents by dragging them on to a LockNote window.
One problem with the application is that it creates a executable and hence makes it difficult to share secure notes.