Blogging is a great way to promote your site and these days it is easy to do also. The most common platform is WordPress which this allthebizz blog is power by, but there are others also.
Tumblr is popular – an example of a Tumblr blog can be found here.
Blogger is another.
Using blogs can be a great way to promote your website, having too many links of a particular kind does not work well for Google the leading search engine so spreading around your link building makes a lot of sense.