I just read the W3C docs, and google for anything I don't understand. For Javascript I look at
www.quirksmode.org and devedge.netscape.com.
Our website is done in PHP and XHTML, with some perl to generate the static gallery thumbnails, and a pure CSS layout. The server sends the content xhtml+xml for everything other than IE to remain standards compliant (also, if there's a syntax error anywhere, the entire website breaks, which helps keep standards compliance). I plan to add a style switcher soon, but feeling lazy now. We are also using mod_rewrites to hide the ugly PHP URLs for aesthetic purposes (also makes it slightly more difficult to pass potentially malicious parameters, though we also check for those in the scripts).
www.broken-llama.com/robotics