Well, organization, for one thing -- it's one book instead of "a dozen places on the Web" for each topic. Location, for another. Accuracy, for a third. Fourth, cost. Lastly, bias.
I'm all for free textbooks for the school, but those who write them occasionally want to get paid for their work. If the school buys a textbook, they have similar editions for all the students in the class and assurance that someone has vetted them for accuracy, minimal bias, and clarity for the level of student. It's also free to the student. The cost to the school is spread over several years. Online resources are currently too expensive or scattered and useless.
Bias is similarly easier with a book - Howard Zinn was a socialist. Knowing that meant you could easily work around it or extol it but you'd always be dealing with a known quantity. Websites change too often for you to trust them without verifying.
Hoo boy, trust. What if that website you linked to in August is kaput and serving ads in December when the parent tries to follow it -- or worse, gets squatted on by Stormfront -- and that parent hits martinlutherking.org (NSFW) instead of the main page for the King Center (the real one). A textbook gets vetted once.
Accurate? Accuracy matters: Read here:
Technology might be the Answer but not ... for the story of the definition of Radian.
Free online doesn't necessarily mean free to the student. I've noticed that free materials invariably are better and easier to use when printed - that's a cost for the student, especially if we're talking about inkjets. It always amuses me when conference people make a big noise about "saving money, paper and the environment by not printing out notes and handouts" and then you look around at all the attendees who printed everything out themselves at their expense on less efficient inkjets.
Then, there's readability. Those textbooks that are free on the web -- I'm thinking the California initiative -- are not easily read. I'm reminded of the study comparing ease of reading of Kindle, iPad, paper and computer screen (including laptop). "iPad, Kindle, and the printed book all scored fairly high at 5.8, 5.7, and 5.6, respectively. The PC, however, scored an abysmal 3.6." Imagine if they had been working with a math book? Again, I have hopes for the iPad or a similar, but it's not quite worth it yet.
Let's pretend that we're not printing out material, just accessing it. How trustworthy is it? Is it "Wikipedia good?" Has it been edited recently by someone who knows the truth or is the urban legend version of history taking hold here? Just because everyone knows that "tea partiers" are the only true patriots doesn't mean that it's a true fact. I have confidence in that printed book.
Why is the online textbook free? Is it free because it's the pdf version of the second edition, copyright 1990?
Organization is another big issue for me. The material for a typical history or even math course would be so widespread over the internet, it would be a tremendous pain to find and collate. Why should I spend that time and effort finding and verifying what the book publisher is willing to do for me? Nothing will be free but I think that iPad (click above to enlarge) holds the most promise.
Then there's linkrot. I took an online thing this summer and 1 of the links had expired and was serving ads - less than a month after the link was created. You would have to recheck everything every year to be sure that the page hadn't changed nor had any others on the same site.
Finally, there's cost. You can't carry a desktop computer. Laptops and netbooks have a serious distraction issue, they're delicate and they're tough to read because of that vertical screen. iPad shows the most promise but, starting at $499, isn't affordable by every student. With an initiative, we could supply them to every student -- cheaper than a laptop -- and escape the problems with laptops in the classroom, damage, viruses, etc.
In sum, we're close. I can taste it already. We just need a little push.
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