Interesting article by Jack Herrington of O'Rielly's ONJava: http://www.onjava.com/pub/a/onjava/2003/10/15/php_scalability.html (it was a slashdot topic today) Cliff Notes: Scalability is based on architecture design and Java (JSP + EJB) vs PHP are two different tools which are scalable. - There's a lot more involved with the article and makes for some interesting reading about application design in general. It also boils down to having the right tool for the right job. The idea of the article is not to dismiss PHP as not being as scalable. There's some interesting arguements about how PHP can not scale and the arguement is turned right around and applied right back to Java (hinting that Java might not be as scalable as Sun is making it seem).