I like the Merriweather font on her blog, very easy to read. This is now my fav serif font. The #444444 color helps too. I suppose she's a book historian - she knows what she's doing in that regard. I wish more bloggers knew the value of not making text completely black on white. On the topic, what more can be said? She's spot on with "don’t confuse popularity with engagement." It's not just special collections that…
What is the reason for not having #000 on #FFF or #FFF on #000? Personally, I find the contrast suboptimal in any other combination.
The easiest design trick to make a website more reader friendly is to move a black font to a grey font. (Obviously there are exceptions and personal preference involved, such as yours)