The basic concept around "living URLs" is this: An article lives at one URL and gets added to, edited and updated over time, similar to Wikipedia articles. Michael Gray took a stab at getting from first post to comments, but after putting a little more thought behind the concept came up with another idea.
Although Gray warns his idea is an "experiment in progress" and shouldn't be taken as a tested and proven SEO practice, he outlines what the "living URL" might look like and how it would work. One of the goals isn't to update the page, but rather relocate and add the new content as needed.
Read the whole story at Graywolf's SEO Blog »