You have been warned, please don’t spoil yourself. This refers to books referenced in S2 of Good Omens, but I am not relating them to events or plot.
EDIT: @ineffable-romantics gave some really excellent suggestions. Having rewatched and looked up their starting sentences, I think these are right. I suppose only Neil Gaiman or Douglas Mackinnon could confirm 100%. More below.
In episode 2 we get a shot of a book shelf. I have compiled the titles, though two are illegible. For one you can make out the publisher mark, the other is too far back in the shadows. I have listed them in order on the shelf, plus the books that Gabriel picked up.
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The Books:
I Capture the Castle - Dodie Smith
No Woman No Cry - Rita Marley
A Tale of Two Cities - Charles Dickens (Mystery book, in the shadows)
The Crow Road - Iain Banks
The Curious Incident of the Dog in the Night-Time - Mark Haddon
Catch-22 - Joseph Heller
Love in the Time of Cholera - Gabriel Gracia Marquez
The Bell Jar - Sylvia Plath (Mystery book, publisher mark visible but I can't make it out)
Nineteen Eighty-Four - George Orwell
The Big Sleep - Raymond Chandler
The Bible
The Great Gatsby - F. Scott Fitzgerald
The Catcher in the Rye - J. D. Salinger
A Series of Unfortunate Events - Lemony Snicket
Herzog - Saul Bellow
Pride and Prejudice - Jane Austen
Good Omens - Neil Gaiman & Terry Pratchett
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Here’s the opening line for The Bell Jar:
‘It was a queer, sultry summer, the summer they electrocuted the Rosenbergs, and I didn’t know what I was doing in New York.”
And for A Tale of Two Cities:
‘It was the best of times, it was the worst of times...”
Gabriel reads this aloud in the bookshop (07:14), and shelves it near the Crow Road! Mystery solved? Perhaps. (Wait and see?)
“X-Ray Trivia” from Amazon Prime states “The Good Omens Book Club - Co-showrunners Neil Gaiman and Douglas Mackinnon would love for everyone to read these books. Douglas Mackinnon put these books in alphabetical order, starting with their first sentence.
All the books ‘Jim’ has reshelved so far by alphabetical order of ... the first line in each. Each book’s first line begins with ‘I’.
Gabriel shelving a book near Iain Banks’ ‘The Crow Road.’
A song about a man who bids farewell to his beloved woman, with whom he has shared hardships, and goes off to war. I would say it's an almost perfect song. However, I once met a woman who said, ``I don't like this song.'' I'm guessing that this is probably because it can be interpreted as a song about "a selfish man who leaves her for whatever reason." Women may want men to always be by their side.