Creating new user/message notifications on admin page

I have created a website that allows users to register and send comments using a contact form.

I have also configured my admin pages using data assist and security assist.

I just wondered if there was any way I could display a notification in my admin if a new user registers.

When I click on the notification I would then be taken to my user results table. On the results table beside each new user name I would like to display some text that says "new". If the admin clicks on the user to go to the detail page I would like that text to dissapear.

What I am trying to achieve is similar to how email notifications work on e.g. iphone. You get that red notification telling you how may new emails you have recived and when you open the email app that notification goes away.

Your help is much appreciated