tryton said:
I guess I'll play with it for another year or so and then start on another, been eyeing XML for a while.
They say that you should learn one new programming language every year. I've been thinking about taking a look at Ruby or Python. But I'm definitely sticking with PHP for my main web development language.
It should be noted, of course, that XML isn't a programming language, it's a markup language, though some efforts have been made to use it for high-level programming. And anyway, if you know HTML, it's only a very short leap to XML. Of course, XSL and such are different creatures entirely. You could probably spend a whole year just learning XML, XSL, DTD, DOM, XPath, and so on. Perhaps my favorite site for reference when it comes to XHTML, CSS, XML, JavaScript, and so on, is
W3Schools. Check it out. Their tutorials aren't great, but once you know the basics, their reference sections are fantastic.