Examples of beautifully designed php applications
SwellJoe: Your definition of beautiful code and mine differ.  I don't care which buzzwords the code is compliant with.  I care that it is easy to modify, easy to read, well-documented, and well-maintained.  Drupal is most of these things, Joomla is none of them.  Wordpress is a mixed bag.  OSCommerce has had too many maintainers with too little experience get hands on the codebase over the years.I agree with you on the insanity of URLs in a lot of applications...but they are an option because many Open Source projects want to run on as many systems as possible, and not all deployments have permissions needed to rewrite URLs or to run standalone application servers and setup proxy rules.  Drupal, at least, makes the URL mapping completely painless.  Joomla has perhaps the worst native URLs I've ever seen (index.php?option=com_ugly&task=view&id=2985&Itemid=33), and the URL mapping modules do hateful things and end up generating an infinite stream of different URLs depending on how someone got to the page.  When we moved from Joomla to Drupal, we literally shed a couple hundred thousand URLs, without losing any content (we actually have about 50,000 individual pages, counting forums, issues, and docs).But, you're conflating two orthogonal issues by assuming that MVC naturally maps to good URLs while other approaches do not.