HipHop for PHP is a source code transformer for PHP script code. HipHop programmatically transforms PHP source code into highly optimized C++ and then uses g++ to compile it to machine code.
The BGTSoftware SSC is a style-sheet creator that uses PHP, XHTML and JAVASCRIPT. It uses a nice graphical user interface that generates a hip and happening style-sheet customised to you, ready to use in minutes.