TidBits is a free web-based personal digital wallet application. It allows you to store small bits of information such as usernames, passwords, URLs, or anything you might easily forget. You then only need to remember one password, your TidBits password, to access all your other bits of information.
Visit the Live Demo download page to download a complete, pre-configured TidBits application which you can run without any setup or requirements other than a Java 5 JDK or later. This can give you a good idea of how TidBits works and be used as a starting point for configuring TidBits for your own use.
The TidBits project page on SourceForge contains project info.