Just go to www.amazon.com, now click on "Directory of All Stores" near the bottom, then scroll down to the copyright notice at the bottom. Now grab your mouse a little bite there, and wnder the "1995-2005" you will find an invisible link which will take you to the farewell page for one of their employees
... Jeff Bezos February 2002 PS: In tribute to David, this Easter egg will reside on the Amazon.com Web site in perpetuity. ....
Lovely... I got a site banned for having a hidden counter recently. The site has been around for almost 10 years now, with that same hidden counter and no problems. Of course I don't think this counts as hidden text. I think that Google is more concerned about that than hidden links.