On my main site, I added a list of Internet Marketing Forums. Joining forums can be a useful way to interact with other people running websites, and for promoting your own site. You can add your blog feed to your profile on some sites, your homepage URL to your profile, and various links to your signature. Some will allow you to advertise your site as well.
Don’t abuse any of this though, or you’ll probably get banned from the forum. Only directly advertise your site where and when you’re allowed, don’t spam posts just to get your signature links as many places as possible. If you’re a good community member, it’s more likely people will be interested in what you’re offering, or help you if you have problems.