Possible quotes:
"It's a terrific series, subtle and dramatic and stimulating. Smart guy, good writer. Poses hugely terrific questions that I, too, had thought of... and a number that I hadn't. I wish all Potter fans would go here, and try on a bigger, bolder and more challenging tale."
'This is a book whose title still makes me laugh and yet it may just turn out to be one of the greatest books ever written. The writing is shockingly good, the plotting is some of the best in all of literature, and the stories are simply pure genius. I fear this book may never get the accolades it deserves, because it's too hard to look past the silly name and publishing model, but I hope you, dear reader, are wiser than that! I must-read."
- Aaron Swartz
"Oh Thoth Trismegistus, oh Ma'at, oh Ganesha, oh sweet lady Eris... I have not laughed so hard in years! Read it and laugh. Read it and learn. Eliezer re-invents Harry Potter as a skeptic genius who sets himself the task of figuring out just how all this 'magic' stuff works. Strongly recommended. And if you manage to learn about sources of cognitive sias like the Planning Fallacy and the Bystander Effect (among others) while your sides are hurting with laughter, so much the better."
"Harry Potter and the Methods of Rationality is the sort of thing that would technically be called a fanfic, but is more appropriately named a work of sheer genius. It takes the basic Harry Potter story and asks 'what if, instead of a boy locked in a closet, he was a child genius raised by a loving pair of adoptive parents who brought science, reason, and modern thinking to the wizarding world?' LOVE. IT. Read it, seriously. It will change your way of looking at the world."
Quibbling: the ESR blurb looks as if it dates from fairly early in the story, when it looked as if it might be all about how Harry did Science to the magical world, understood everything, and conquered -- excuse me, optimized -- the universe. Someone who decides to read the book because that sounds cool is likely to be surprised and perhaps disappointed at much of the later plot.
The blurb from Rachel Aaron has a similar but (I think) much less serious problem of the same kind: that what-if question turns out to be not quite the right one, although the author has taken some trouble to make it look for a while as if it is.
The books have different focuses, and will have different blurbs. The first book will have a Science! focused blurb since that's what it contains, and the later ones will have blurbs more appropriate to their content.
Edit: Added
The blurbs should fit the volume. A non-exhaustive list of possible things to emphasize:
I can't think of one, but there should be a blurb from the book that seems appropriate to apply out of context to the book.
"You're mine now, Harry thought at the walls of Diagon Alley, and all the shops and items, and all the shopkeepers and customers; and all the lands and people of wizarding Britain, and all the wider wizarding world; and the entire greater universe of which Muggle scientists understood so much less than they believed. I, Harry James Potter-Evans-Verres, do now claim this territory in the name of Science." chapter 6
"The terrifying part was how fast the whole thing had spiraled out of control." chapter 33
"Sometimes you call your brain and it doesn't answer." chapter 79
I'll try a printing company, and look into other options if it does not work.
A modified version of one of the fan PDFs, yes.
Speaking of HPMOR, I wondered about something.
Quirrell often smirks/makes faces to himself while talking to Harry. He's emotionally interacting with himself while talking to others. Does EY do anything of the kind?
Collaborate on HPMOR blurbs; earn chance to win three-volume physical HPMOR.