Apple posts HowTo’s (video)
Apple does a real nice job with documentation; they always have, dating back to my Apple //e days. I always enjoyed the attention to detail they put into their manuals. While I still prefer books to electronic documentation (and always will), these video tutorials are also very nice.
Personally, I will also prefer something I can hold in my hand, and flip through, versus a PDF or other electronic documentation. Apple’s online documentation is done very well, and I highly recommend having a look at it, as an adjunct to their “analog” documentation.