Nice article :)

Bryan: Gigaom seems to be a pretty big site. They have ~6.5 million unique views per month, but I'm not sure how many documents they have indexed-- I bet there are a lot.

And, I wrote about installing these plugins and about how to build Sphinx indexes using the sample configuration file here: http://sphinxsearch.com/blog/2014/11/12/gigaom-wordpress-plugins-and-sphinx-search/

It might be helpful.