Full Contact is a very simple, easy to use contact database with some convenience features.   It saves all entries automatically, and allows for the launch of your default e-mail client to e-mail any entries which contain a legitimate e-mail address at the click of a button.  You may also back up your database with ease, to any folder or to floppy disk.

Full Contact is lightweight and will fit onto a floppy disk so you can take it with you.   Requires no external dll's and includes an installation script.  Completely free and distributable.