A comparison of PHP of Cold Fusion by Mike Sheldon. It's interesting to note that Allaire is moving strongly toward the Java platform, and reports are that CF 5.0 will be an abstraction layer on a Java Servlet engine. Allaire is also very definitely focusing on the Enterprise market, and IMHO is not paying much attention to the "Pro" market anymore. While the profit margins are definitely better in the Enterprise market, there's a whole ton more volume in the rest of the market, which is ripe for PHP to dominate.