Quoting:
2. Shakespeare - Julius Caesar
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Yep.

Quoting:
5. I think it's Pride & Predjudice (Jane Austin)
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Right first time - it is P&P (I've not read Little Women)

Quoting:
1. Doug Adams - Hitchhiker's Guide
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Also correct

Quoting:
7. "I, Robot" - Isaac Asimov

I guess that you haven't read Shakespeare cover to cover - isn't it "cry havoc and let slip the dogs of war"?
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Correct (though it's in loads of Asimov's books as it's his Second Law of robotics)

I've read JC, but it was a long time ago (er.. like twenty years or so).  I originally wrote it as "cry havoc and let rip the dogs of war", then thought "hold on a sec, that's not right" :-)

Quoting:
Is #3 from Good Omens by Terry Pratchett and Neil Gaiman?  And is the speaker called "Things that don't work even when you hit them really hard"?

Betcha never read all of number 5!
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It is from Good Omens, but I think you'll find the speaker is not one of those four bikers of the Apocalypse :-)

Yes, I have read all of P&P (it's the only one I've read cover to cover, and the only one I'm going to, too)

Quoting:
4: Harry Harrison, one of the Stainless Steel Rat books. I'll go out on a limb and guess 'A Stainless Steel Rat is Born.'
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Hey!  I'm glad someone got that one: it's from the first one he wrote (rather than subsequent prequels, IYSWIM), "the Stainless Steel Rat"

And here ends the voting from the Norwegian jury...

Phil

Quoting:
"cry havoc and let rip the dogs of war"End Quote

LOL - that's one set of dog kennels I wouldn't fancy visiting... :)

Quoting:
3. was in response to the multiple choice question "What year did Elvis die"!
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:-)  Sheer brilliance, isn't it?

Phil

PS Hmm... looks like nearly all the fiction's been dealt with.  I'll put up some clues tomorrow morning, methinks.

Quoting:
:-)  Sheer brilliance, isn't it?
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It certainly is!

I'll take a guess at one of the others

10. The Unadulterated cat, Terry Pratchett?

Tao

Quoting:
10. The Unadulterated cat, Terry Pratchett?
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No- it predates Pratchett by a good few years (and is one of many rules by the oldest living person)

Phil

Quoting:
11. Stephen Hawking, I guess it might be 'Brief history of time, (cos that's the only book I've heard of!
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It's the only book of his I've got ;-)  Correct.

Phil

Quoting:
6. If this isn't Groucho, it must be Karl
I'll try 'das Capital'
something I haven't read but really should
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It's got interesting bits in it... well, maybe one or two per thousand pages ;-)

Phil

Quoting:
10. Robert A. Heinlein - Lazarus Man or something like that, I could cheat and look up the book if you'd like...
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"The Notebook of Lazarus Long" or "The Life of Lazarus Long" is the title you're probably thinking of.  The book the extracts are taken from is "Time Enough For Love"

It's worth looking at: http://www.musespace.com/musings/quotes/lazaruslong.html for more of them.

Phil

Quoting:
Thanks for the last answers - should have known #12.
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I thought it maybe a bit too obscure, but it always makes me smile

Quoting:
Good quiz!
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Thanks - I'll have to start collecting quotes as I read.  Only another twenty years or so, and I'll have enough for another :-)

Phil