Feedburner is a feed delivery website. There, you can register your RSS and readers will can receive it in a better format, compatible with their RSS readers.
But, it’s only tip of iceberg. Feedburner has some incredible features, like sending your post updates by email to subscribers (and it’s free) and tweet updates in your Twitter account automatically (it’s free too!). And you can get an HTML code to exhibit your updates in any HTML page – you only need copy and paste that code. And those are only some available features.
I’ve used it with some of my main blogs and I got some visits from email monthly. It helps me to increase my blog exposure in a “set and forget style”. Of course, if you want to get more traffic you should focus on listbuilding and offer good stuff to your subscribers, otherwise, there isn’t automated way to guarantee people will come back to your website!
If you have a blog (self-hosted, wordpress.com, blogger.com or tumblr.com) you should get to setup your RSS in Feedburner in less than one minute – and you only need do it once, so I don’t see why don’t include it in your marketing plan.