[jamescostian]

If you visit a website owned by a company you're probably right. If you visit a little demo (like the type of thing someone would hack up in a day and put up on show HN) you'd be surprised by how much investigation you can do.

I agree that there are many books online though, and they can provide a lot of nice things like running code samples in your browser. However, I find video tutorials to provide a better experience than books, online or not. I suppose that's just a matter of personal preference though.