"XML is like air"

I overheard a co-worker saying "XML is like air" the other day. After an initial chuckle, I find myself thinking about this statement a lot. While I agree that XML is ubiquitous I know there are many authors, editors, and production editors who still think XML is mysterious and something for the IT people.
O'Reilly Media's Start With XML project is a must read for anyone who is not breathing XML. You'll find out why you should care about XML and discover ways to implement XML upstream in your environment.