A notification icon, remniscient of the facebook alert, right next to a menu button. There doesn't appear to be a plugin for this yet, unfortunately, and since I don't have the time to invest in making one, I'll do a quick runthrough of how you can do this to your wordpress site. All you have to do is add a bit of CSS to your page.
StackOverflow user Titus generously provided us with a good CSS snippet for this icon on this post, so I took that and made a slightly modified version so that it works best on newer browsers. You can add this CSS in several ways. One is through the 'Extra CSS' area on your Wordpress via a Theme Customization Option, but you can also achieve this with a simple plugin.
here's the CSS:
position:relative; /* This is crucial for the absolutely positioned element */
/* border:1px solid blue; This is just to show you where the container ends */
position:absolute; /* This breaks the div from the normal HTML document. */
padding:1px 2px 1px 2px;
background-color:red; /* you could use a background image if you'd like as well */
/* The following is CSS3, but isn't crucial for this technique to work. */
/* Keep in mind that if a browser doesn't support CSS3, it's fine! They just won't have rounded borders and won't have a box shadow effect. */
/* You can always use a background image to produce the same effect if you want to, and you can use both together so browsers without CSS3 still have the rounded/shadow look. */
box-shadow:1px 1px 1px gray;
Once that's in place, go to the Appearance -> Menus section of your WP admin page and select the page you want to add the icon to. Drag it over to your Custom menu if you haven't done so yet, then under 'CSS Classes (Optional) ', put noti_Container. You have now set the stage for the icon. Now let's add it.
In that same Menu button editing window, append (don't replace) this code to your Navigation Label:
For example, if you want to highlight your Blog button, You'll put this:
Blog <div class="noti_bubble">new</div>
Save your settings and refresh your page. Tada! enjoy your fancy alert icon.
If you ever want to remove it, you simply remove the
<div class ...</div> from your Navigation Label field.
Not too bad, although a plugin would be nice. but hey, it's possible!