Cory Doctorow has a tradition of releasing a Creative Commons-licensed free electronic version of his books when they come out in the stores. For Little Brother, Cory was a little behind the actual book release — he had the temerity to be offline, having a life with his family, of all things! — but now he’s all caught up and has out up a Little Brother area on his personal site, complete with free CC downloads as well as other ginchy things. Check it out.
Also: if you check it out and you like it (as I expect you will, it’s excellent), go to your local bookstore (or favorite online retailer) and buy it, either to have a physical copy for yourself, or as a gift for a teen you’re hoping to either start or to further encourage on the road to geek rebellion. As you know, around here we’re big fans of rewarding authors one likes with income, so they can maybe write more books later. It’s a virtuous cycle, it is.