wheel - 1:28 am on Jul 5, 2010 (gmt 0)
Having high quality content. If your content is unique and the best available, then quality sites are more likely to link to it.
This is now open to debate.
For years, the best way to get the highest quality links was to have great content then go chase links from quality sites.
This does not work in all industries anymore (it used to). In some industries, high quality sites simply will not link out any longer. And that means that the only way to get one way links is to buy them. Buying links started out as the lazy way to get links, but in some cases it's now the only way to get links. Or perhaps more specifically, there are other ways to get links (networking etc), but in some cases high quality content will do nothing for you.