The use of the <marquee>
element died out many years ago, but a similar effect, created with JavaScript is resurfacing in recent years thanks to its use on high-profile sites such as the typed headlines on the BBC News site, and the animated trending topics on the twitter home page.
This is an effective and attractive way to present potentially relevant content to the visitor without taking up too much content space. It won't suit all sites of course, but used sparingly, and in as non-intrusive a way as possible, it can be a great effect.