Card sorts are an easy way to see if the current architecture of a website is working. They encourage users to volunteer all sorts of information that wouldn’t necessary come out in a standard one-on-one interviewing session. Card sorts can also be used to illustrate to stakeholders how their opinions, terminology, and politics impact site usability.
The full article was published Digital Web Magazine, which no longer exists. So find it here, on this site and an accompanying card sort analysis using a spreadsheet at http://www.ruthstalkerfirth.com/card-sort-analysis-using-a-spreadsheet