Anyone involved in SEO can tell you that organic growth of relevant content is the most successful long term strategy for search engine placement. When people read that, however, their brains toss the part they don't understand or want to deal with: “organic.” What they see is “successful long term strategy” and “search engine placement.” And that's where the trouble starts, because it's the organic growth that does the work.

What do people mean when they talk about organic growth?

Organic growth means slow, steady, continual growth - the way plants and animals grow. When Google ranks your site they look for this pattern of growth to help determine whether your site is “for real.” Think of an informational site you visit a lot, a forum perhaps, or a site like Wikipedia. Those sites did not spring into being overnight, chock full of content and with a hundred links pointing to them. They started as miniatures of themselves, and as people posted messages and articles they got bigger and bigger.

How can this be harnessed to help promote a website?

Timing of updates can be more important than size of updates. A lot of webmasters have a hard time updating their site regularly. They have day jobs, families, and other websites to run. This can lead to a tendency to update sites in large infrequent chunks.

To get the maximum benefit from your updates, do this instead: When you get time to update your site, prepare and arrange your new content so that it can be uploaded in small pieces. Get everything ready to go so that the only task remaining is the actual publish. Then upload each small piece separately, allowing a day or two to pass between each upload.

By doing this your website ends up with the same content, but search engines monitoring how frequently you update will see a pattern of steady growth. You can still write or gather all your content in one fell swoop, just dole it out to your webserver slowly instead of as a single publish. You won't see immediate results, but give this a month or two and search engines will take notice, to your benefit.