Damn you Andy C, that was the only one I knew.

#9 is "Cat's Eye".

8 is Catch-22 by Joseph Heller

edit - damn, someone got it. And number 10, which I knew as well.

QUOTE:
4 is The Crow Road by Iain Banks.

And there was me thinking it was George's Marvellous Medicine

5 is 100 years of Solitude by Garcia Marquez

I"t was love at first sight" is Lolita - Nabokov

"All this happened more or less" is Slaughterhouse 5 -Kurt Vonnegut.

Right, seeing as the books forum has picked up lately, let's keep this going and make it nastier. Some OTF favourites here, plus a couple of trickier ones with great opening lines. (Character names blanked out, cause they're giveaways.)

11. So here I was, home again after all those years.

12. Stately, plump **** ******** came from the stairhead, bearing a bowl of lather on which a mirror and a razor lay crossed.
James Joyce - Ulysses (guessed by ursus)

13. Beyond the Indian hamlet, upon a forlorn strand, I happened on a trail of recent footprints.
David Mitchell - Cloud Atlas (got by S. aureus)

14. May it please heaven that the reader, emboldened and having for the time being become as fierce as what he is reading, should, without being led astray, find his rugged and treacherous way across the desolate swamps of these sombre and poison-filled pages; for, unless he brings to his reading a rigorous logic and a tautness of mind equal at least to his wariness, the deadly emanations of this book will dissolve his soul as water does sugar.

15. Having placed in my mouth sufficient bread for three minutes' chewing, I withdrew my powers of sensual perception and retired into the privacy of my mind, my eyes and face assuming a vacant and preoccupied expression.
Flann O'Brien - At Swim-Two-Birds (guessed by Andy C. When I say "guessed" I mean "identified" don't I? Why do I keep saying "guessed"?)

16. "What's it going to be then, eh?"
Anthony Burgess - A Clockwork Orange (guessed by Kowalski)

17. Over two months elapsed before *** ********* could immerse himself in the peaceful silence of his house at Fontenay, for purchases of all sorts still kept him perambulating the streets and ransacking the shops from one end of Paris to the other.
JK Huysmans - A Rebours (Against Nature/Against The Grain) (guessed by The Horse)

18. Once upon a time in Westphalia, in the castle of Baron *******-***-*******, there lived a young boy whom nature had endowed with the gentlest of dispositions.
Voltaire - Candide (dead heat between Crusoe and Ursus)

19. For a long time, I went to bed early.
Marcel Proust - Swann's Way (guessed by Carlo Ginzburg)

20. The studio was filled with the rich odour of roses, and when the light summer wind stirred amidst the trees of the garden, there came through the open door the heavy scent of lilac, or the more delicate perfume of the pink-flowering thorn.
Oscar Wilde - The Picture of Dorian Gray (pieced together by Ibn and Ursus)

16. A Clockwork Orange

#19. Swann's Way

A hello to Carlo Ginzburg, and if I may say so, a kickass choice for a username. I was disappointed I never got to takea class with Prof. Ginzburg while I was in college.

18. Candide, Voltaire.

18. Candide

Damn you, Ursus!

Genuinely sorry, Crusoe.

12. Ulysses, James Joyce.

Wow, you lot are fast.

I haven't read it yet so I'm not sure but:

17. Against Nature

?

Impressive.

I think 13 is Cloud Atlas, by David Mitchell.