A lot of people are unaware that you can actively market not just your blog or website, but also your the RSS feed of your website. Your RSS feed a way for your content to leave the confines of your own domains, and spread throughout the web, pointing backlinks to your domains and spreading affiliate links.
Although you have no control over where this content will be shown across the internet, there are good SEO benefits to be had for allowing your content to be syndicated. Back links from a wide variety of sites, who have content that is in the same subject area as yours are worth pursuing. Even if the page rank of the linking sites is lower than yours, as long as the links are one way then they will not harm your organic SEO.
If you embed your content with affiliate links, or sales material for your products that you could end up with these being syndicated across a number of related sites.
By using online feed aggregation services, other switched on users of these same services will see your feeds, and mix them in with their own aggregated content.
Its all about thinking of your online marketing activities as a publishing network, a hub in which your blog and a few choice social media profiles are at the centre. Those that have the furthest reach have the highest chance of getting their message heard above the noise, and actually getting to prospects before the competition does. Any way that you can write once, and have your content appear in multiple areas (at least a snippet of it) is an advantage.
I will write more about these services as I utilise them on this site, but here are some of the best.