According to Librarything, Terrance Dicks (77), followed by Terry Pratchett (45) and Clive Cussler (23)
2) What book do you own the most copies of?
Apart from multiple translations of the Bible, probably The Hitchhiker's Guide to the Galaxy & The Restaurant at the End of the Universe - for each one I've got three different editions: original publication, film tie-in, and 30th anniversary re-release.
3) What fictional character are you secretly in love with?
Probably the Doctor (as in Doctor Who). There've been books written about him, so he sort of counts.
4) What book have you read more than any other?
Not sure, but it could well be Come Back, Lucy by Pamela Sykes - I loved the TV adaptation, bought the book on the strength of that, and have read it multiple times since - I used to read it every Christmas, along with The Box of Delights.
5) What was your favorite book when you were 10-years-old?
I can't really remember my actual favourite, but Terrance Dicks' novelisation of Doctor Who and the Destiny of the Daleks has a special place in my affections - it was novelised within months of the original TV broadcast (I think I was given it for Christmas that year, so within a week of my tenth birthday), which meant I still had a fairly vivid recall of the episodes when I read the book. I recall doing a reading from it as part of my elocution classes.
6) What is the worst book you've read in the past year?
Probably Crescent Dawn by Clive Cussler. It wasn't bad, but...see comments in earlier post...
7) What is the best book you've read in the past year?
The Glass God by Kate Griffin. I love what she writes anyway, but with this in particular, she's on top of her game.
8) If you could tell everyone you know to read one book, what would it be?
Right now? See answer to number 7! :-)
9) What is the most difficult book you've ever read?
Probably something I was forced to read for the purposes of school. I maintain a certain loathing for Hemingway's The Old Man and the Sea, which, frankly, bored me rigid.
10) Do you prefer the French or the Russians?
I'm not sure I've read anything by either, not even in translation. Although I've always wanted to read War and Peace.
11) Shakespeare, Milton or Chaucer?
No opinion. As Sarah says, Shakespeare is meant to be performed, not read; I've not read any Milton; and Chaucer, although I found interesting, I didn't find that interesting (although hearing it read in modern approximations of what his middle English might have sounded like is a fascinating experience...)
12) Austen Or Eliot?
Eliot, but only because I can at least claim to have read (and loved) one of her novels (Silas Marner). Which as that was one I read for school is an achievement!
13) What is the biggest or most embarrassing gap in your reading?
I've never read much about British history in the period of 1400 - 1500 and 1600 - 1700 (despite studying quite a bit of the intervening century at school). I don't know whether that counts as "embarrassing" or not, but as I'm interested in the Wars of the Roses, Richard III and the Princes in the Tower from the first of those periods, and the English Civil War from the second, it is a gap I hope to put right.
14) What is your favorite novel?
There really are too many to just list one, I'm afraid. Although, quite possible, one of the Hitchhiker's Guide to the Galaxy series. Possibly So long and thanks for the all the fish.
Does Joseph and the Amazing Technicolor Dreamcoat count?
Ditto. Poetry is never something I've really read or studied.
18) Short story?
I tend to be a novel person rather than a short story person. I mean, I'll read short stories, but I don't have any opinion on what would constitute a favourite.
Again, I don't really have much of an opinion. I'll happily read anything that strikes me as interesting, but can't think of anything specific that would constitute a favourite.
20) Graphic novel?
The Tintin books. Particular favourites are The Secret of the Unicorn/Red Rackham's Treasure and Destination Moon/Explorers on the Moon.
Does Pet Shop Boys, Literally count as a memoir? Because if so, definitely that. Brilliant book.
As I said, I want to read more history, particularly in the areas I mentioned above, but for the time being it's a field I remain rather under-read in.
23) Mystery or noir?
I don't really read much of either.
24) Science fiction?
I love myself some science fiction. Probably my favourite genre.
25) Who is your favorite writer?
Douglas Adams, Stephen Fry, Clive Cussler (for all his failings), Julian May, Kate Griffin, Terry Pratchett. Probably others, including many writers of Doctor Who novelisations and spin-offery (Malcolm Hulke and Ian Marter in particular), but those are the ones that immediately come to mind.
26) Who is the most overrated writer alive today?
I've not, and probably won't, read any of his works, but Dan Brown, I suspect...
27) What are you reading right now?
I'm about 50 pages into Rivers of London by Ben Aaronovitch. Loving it hugely so far.