For the best list of tips I've ever seen on how to market your blog, check out Tony Hung's guest article at Problogger.

Some of my favorite tips in his article:

Join a blog carnival: Where every blogger who joins one blogs about a topic, then each blog gets promoted. Here’s an index of blog carnivals to get you started.

Guest blog: Offer to do it for free, and you’ll be able to demonstrate what you know to an entirely new audience. Gives you great credibility, and of course, most will allow a courtesy link back to your own blog. A free foot-in-the-door to some communities as well.

Participate on larger blogs in comments: but try and be one of the first few commenters on heavily trafficked sites to get recognized — most people won’t read past the first 10-20 comments.

Spend time to create links and trackbacks: In every post spend as much time as you can to create outbound links to relevant and high linking blogs; many blogs automatically have trackbacks enabled, so in their comments section they will have a link back to your blog.

Publish original research: If you’ve got the time, start with a question, try and figure it out with the data available, and “publish it”.

Of course, not all the tips fit for everyone. For example, Tony recommends joining Helium to submit expert articles. It sounded like a good tip, so I checked out the Helium website. My first impression was positive, as they have an attractive and professional-looking website. But when I perused a couple of articles I discovered a diverse range of quality. Some articles were good but an equal number were weak.

There are so many high-quality places to post on-line articles (such as Associated Content and iSnare to name just two) that it doesn't interest me to post articles at a site with spotty quality.