Expinion.net: Random Quote
Random Quote allows you to randomly display quotes, jokes, testimonials or any other text. All powered by online secured administration, it has never been easier to implement random text in your web site. The WYSIWYG text editor lets you add links, text formating etc. much the same way as you would in Windows.
Best of all, it's free ! (So there is no problem if you want to install it multiple times for randomly selected testimonials in one portion of your site, randomly featured links in another, maybe jokes too!)
There is no catch, no adware or popups, no emails from Expinion afterwards.