The original Testimonials Manager plugin by Gobala Krishnan is useful, but not particularly built with purists in mind. The default CSS is forced on you via internal styles sheets just before the elements that need them in the body, and there’s some divitis going on instead of semantically correct blockquote and cite elements.
At some point, I may fork this plugin completely, but until then this page is a placeholder URL for the modifications I do on the plugin for clients, so that the plugin doesn’t recognise any updates the original code may get (which would then overwrite my changes).