The site you referenced is the site on which I am most heavily using CiviCRM. I do have CiviCRM installed on my primary business site at http://www.jmdezigns.com, although there is really no front-end functionality for you to look at there. However, on that site, I have started a community forum to discuss and get further support on the integration of CiviCRM with WordPress. CiviCRM does no require any additional plugins to work with WordPress.
I know that the official CiviCRM support forums reference a number of other functional CiviCRM-Wordpress integrations that you can take a look at. You will have to dig around the forums though to find the demos. I will set up on my site, a forum for people to list their demos of functional CiviCRM-Wordpress integrations. Perhaps you can also list yours there as well.