If it comes to my attention, I really don't care, as long as it's discursive written text, i.e. not audio or slides.
What are people's objections to PDF? For me PDF has two advantages. A PDF can include complex mathematics, which most papers I read do. This is generally done badly or not at all in other media. PDFs are also self-contained: I can download a PDF and have the whole thing, which is not always possible with HTML. A downside is that they don't reflow to accommodate the window size, making them awkward to read on a phone, but most HTML is broken in that way as well (including e.g. LessWrong). I've little experience of other e-book formats.
What are people's objections to PDF?
Mostly moral objections, for me.
In our discussion of academic papers, Lukeprog argued that lots of smart people preferred to read ideas in academic paper format. Based on my observations, I mostly disagree. But that's just anecdotal evidence. Let's use Science!
Suppose someone at the Singularity Institute thought up a cool new idea: it could be about rationality, Friendly AI, decision theory, making money, or any of the other topics we discuss here on LW. Explaining it takes about ten pages, and it's nontechnical enough that it can be explained to a general audience of non-mathematicians. Which of the following explanations would you be most likely to actually sit down and read through?
EDIT: To state the obvious, this poll will be biased in favor of blog postings, since it's on a blog. However, I still think it'll provide data that's much better than anecdotal guessing. I've emailed a few rationalist mailing lists to try and counteract this effect.