@KD = That's probably because the W3C doesn't control PHP... only the (X)HTML standards. The maintenance of PHP belongs to a different organization. W3Schools is where I go when I want the latest help on HTML ... if I'm looking for PHP help I go to php.net...

@benderman - it's good for any kind of dynamic server side processing... like these forums... I use it to run a radio station, I've used it for ecommerce sites, basically anything where you need/want to do logic on the server, then simply serve up html to the client browser.

-tg