http://wizards.com/default.asp?x=dnd/4news/20090428

Wizards of the Coast is now offereing free content to teach you how to play 4e! 

Ok, now I've filled my excitement quota for linking to it. Pretty much WOTC is release Keep of the Shadowfeld for free to anyone who wants to download it, and giving out little primer material to get new players aquainted to the system. I don't think any other system has thought of this before . . . wait . . . ya, every other system has done this before. Welcome to the internet, WOTC.