I do have an example of it working so to speak. Its completely non forum-software related, but should provide a good comparison. vpsspeed.com is a VPS hosting provider which I ran for a year (since sold off). When we first launched, the growth appeared to be slow and most people came from adverts being posted in the webhostingtalk.com forums.
About 3 months after launching, I redeveloped the website, and renamed our pages. We had a page to cover each opperating system, for example "CentOS VPS Hosting" was the title one one of the pages. The URL structure was index.php?page=centos-vps-hosting. After the relaunch, we moved the content to be rewritten to /centos-vps-hosting.html This was done for each of the OS specific pages.
I should not we did NO additional advertising at all.
Even to this day, if you type in to google something like "Debian VPS Hosting" you will see it is on the first page - we used to be on page 20 something. Try "Gentoo VPS Hosting" or "OpenSuse VPS Hosting".
Now obviously this is a slightly different method, but the fact is after just changing the URL structure - we hit the top of google!