Now I will be the first to admin that this is probably not the most necessary feature one could add to their web application, however sometimes these little features can show that your application has the polish of a mature application.
With this jQuery plugin you can make your password fields work the same way they do on your iPhone/iPod Touch. For those of you that do not use these devices, the last character you type is shown plain text, while the others are shown as the usual bullet. The front end code requires very little code and on the processing end you have minimal modifications. What you get is a cool effect that will make your application stand out from the others.
To download or find out more about this cool plug-in head over to: http://blog.decaf.de/2009/07/iphone-like-password-fields-using-jquery/