I think Brett's article is great and his list gives the essential things you should do.
His 8th point is to make your site interactive so that visitors can interact and deepen their involvement. As a development of that idea, a parallel blog may achieve that better. Commenting is a natural part of the blogging phenomenon so you may get more interaction. A blog is a more instantaneous thing whereas a website sounds more durable and long-lasting. The blog also expands the cross-linking possibilities for search engine optimization purposes. Finally with an RSS newsfeed, you can alert your visitors who are in to that when they should be back for the latest news items.