If you're looking for an impressive fiddle, check out this link (not my creation, but stumbled upon it during the same search). The solution is similar, but the styling has a touch of elegance.
a {
color: #900;
text-decoration: none;
}
a:hover {
color: red;
position: relative;
}
a[data-title]:hover:after {
content: attr(data-title);
padding: 4px 8px;
color: #333;
position: absolute;
left: 0;
top: 100%;
white-space: nowrap;
z-index: 20px;
-moz-border-radius: 5px;
-webkit-border-radius: 5px;
border-radius: 5px;
-moz-box-shadow: 0px 0px 4px #222;
-webkit-box-shadow: 0px 0px 4px #222;
box-shadow: 0px 0px 4px #222;
background-image: -moz-linear-gradient(top, #eeeeee, #cccccc);
background-image: -webkit-gradient(linear,left top,left bottom,color-stop(0, #eeeeee),color-stop(1, #cccccc));
background-image: -webkit-linear-gradient(top, #eeeeee, #cccccc);
background-image: -moz-linear-gradient(top, #eeeeee, #cccccc);
background-image: -ms-linear-gradient(top, #eeeeee, #cccccc);
background-image: -o-linear-gradient(top, #eeeeee, #cccccc);
}
Here's some HTML to go along with it:
<p>Pellentesque habitant morbi tristique senectus et netus et malesuada fames ac turpis egestas. <a href="#" data-title="Hello, i am a link">Vestibulum</a> tortor quam, feugiat vitae, ultricies eget, tempor sit amet, ante. Donec eu libero sit amet quam egestas semper. Aenean ultricies mi vitae est. <a href="#" data-title="This is another link">Mauris placerat</a> eleifend leo.</p>
Hopefully, someone finds this information useful!