Noah Brier has done a small website with a great, yet simple idea. Brand tags simply collects tags and comments for brands by users entering the site and then displays the tag clouds. More than 100.00 people have tagged already giving an interesting look at all the brands on the site.
I always thought that tagging and tag clouds or web 2.0 things like tweetclouds are great tools to analyze and display the results of interviews and focus groups. What works with brand tags on the larger scale can be done for single client, too.