- Linking. Whenever you name-drop another company/name/practically anything and anyone with a website, link it. It increases relevancy when people use search terms for that website.
In addition, if what you are linking happens to be a blog and it also happens to accept trackbacks, linking to particular posts of theirs will, in turn, post a comment on their post with a link back to yours.
Obviously, you shouldn't be a dick and link every post of every blog ever, but if, say, you are posting about your own development process and can relevantly reference something some other blog has written about, you'll not only have a post that is (ideally) of some interest to your readers, but also promotes itself elsewhere to another group of people who might be interested in it.