What, I need to choose? *sigh*
I can't settle on just one post but my nicest memory would be embarking on the A to Z of Writing blogging challenge that a few author friends and I organized (not about books per se). We each posted about a writing-related topic to cover the whole alphabet - sometimes with only one author/post per letter, sometimes with multiple ones or mentioning books. Here are mine:
A for Authorpreneur
C for Coauthoring
E for Epilogue
F for First Person Narration
H for Hero Types
J for Jargon & Slang in Fiction
L for Length
P for Prologue
T for Titles
U for Using the Senses