No skepticism in this topic, just geekery.
Got a favorite classical element? Got some favorite non-classicals that different fantasy settings put alongside the standard four?
I've usually been a fan of Air, though lately I've been drifting towards Water. Non-classicals I like are Wood and Metal. Light and Dark tend to be good additions as well, but I prefer they be without the good and evil connotations.
Any particular fantasy materials you like, along the lines of mythril, adamantite, cold iron, etcerta?
Feel free to ramble on about any fantasy setting, homebrew or published.