PHP just keeps getting better and better. A close competitor is Python, which is better than PHP for coding bots and the such I believe, but that is where the better part ends in my opinion.
Yea, PHP all the way. Go search on CodeCanyon.net for scripts and you'll see PHP has it's own category, as does Javascript, which is also a nice language you can do some SERIOUS business with. You can do everything in Javascript including re-writing an entire web page to make it become, say, Google.com on your domain.
Give me a one line inclusion of Javascript code on a web page and I can control everything on that page from an entirely different domain - powerful stuff.
I don't like ASP.net or Microsoft IIS, I don't really code on Windows, web coding pays me well. C# never got into it, worked with C, C++ and the such before but these days object-oriented Javascript and PHP really gets me going.