The site is: http://scooterforum.net
The site is about 14 years old and we had some very busy times with 10k uniques a day. Currently we are a fraction of that due to my sickness and almost a month of downtime and bad choices in forum software (vb3 --> vb4 worst choice) + penalty in Google rankings.
Now I'm transferred to XenForo and I'm really happy with the look and feel of it. At first I did not plan to use a lot of add-on because I did not want to rely on 3rd party developers, but the great add-ons available made it to hard not to.
The style is based on UI.X. We use the Extra Portal, Showcase, Directory and Xen Media Gallery as the biggest add-ons. Also some other great add-ons like those from xfrocks
Still working on a good wordpress bridge, currently working with the xfrocks one but it needs to evolve some more.
So please shoot on the design or other things I overlooked or that I can improve for a better user experience.