I just started playing with it. I worked through their quickstart example and am now trying to figure out how to use the Zend_Test stuff working so I can create some unit tests. I had been having trouble finding decent info on the bootstrapping process but then I stumbled upon this video
They were "Don't Make Me Think" by Steve Krug (This is a quick read and really great!)
Also, the other book was "The Design of Site 2nd Editions" byDouglas K. Van Duyne, James A. Landay, Jason I. Hong. This book is HUGE but we only read a couple of Appendix that talked about usability testing. This one we looked at in Barnes & Nobles :P
=) Hope this helps! John and I also posted some links too on our project blog - http://kristinaleh.com/utsa/cal/wordpress/?p=178
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