Do old techniques get paced out as fast as the current changes? How do we know if there are changes in the algorithm?
Internet marketers/bloggers adjust as Google changes the rules or they slide out of search engines and are replaced by others who will adapt to these new rules. Since Google Penguin update came out some time back, i'm constantly seeing articles with headlines such as 'Link Building Tips Since the Google Penguin Update'. Here's an example. http://www.mckremie.com/blog/2012/05/7-link-building-tips-after-the-google-penguin-update/
What a good way to get people click on their site. But I noticed that some of them are existing tips even before Penguin or Panda rolled out.
Either these techniques are still applicable or the writer needed more material to flesh out the article.
Maybe they are still applicable and haven't been affected by Penguin or Panda at all. Of course, you need to choose wisely before you do link building on a site.
Linking from quality sources is still the best idea, rather than mass backlinking from unrelated sites. Though some people are claiming very good success backlinking from .gov/edu blogs, even ones not related to the content of their own sites.