Non-fiction
The Language of the Night, by Ursula Le Guin
Dreams From My Father, by Barack Obama
The Bloody Sunday report
Non-genre fiction
Njal's Saga
The Sun Also Rises, by Ernest Hemingway
The Dubliners, by James Joyce
A Town Like Alice, by Nevil Shute
A Farewell To Arms, by Ernest Hemingway
sf and fantasy
The Wee Free Men, by Terry Pratchett
The Turing Test, by Chris Beckett
Lavinia, by Ursula Le Guin
Another reading of the question would be my favourite book published this year. The only book on the above list in that category is the Bloody Sunday report, but other books of 2010 which I have enjoyed include:
Non-fiction
Triumph of a Time Lord by Matt Hills, a very approachable academic treatment of Doctor Who;
A Fortunate Life: The Autobiography of Paddy Ashdown
sf and fantasy (non-Who)
The Restoration Game by Ken MacLeod, which I read in proof last year and thought was fantastic;
The Hundred-Thousand Kingdoms by N.K. Jemisin
Doctor Who
Dead Air by James Goss, the final Tenth Doctor audio
Day 01 - Your favourite series of books (with more than 3 in the series)
Day 02 - A book that you wish more people had read
Day 03 - Your favorite recent book
Day 04 - Your favorite book ever
Day 05 - A book you hate
Day 06 - Your favourite writer
Day 07 - A writer you don't like
Day 08 - Your favourite work in translation
Day 09 - Best scene ever
Day 10 - A book you thought you wouldn’t like but ended up loving
Day 11 - A book that disappointed you
Day 12 - An book you’ve read more than twice
Day 13 - Favorite childhood book
Day 14 - Favorite male character
Day 15 - Favorite female character
Day 16 - Your guilty pleasure book
Day 17 - Favorite trilogy or tetralogy
Day 18 - Favorite book cover
Day 19 - Best ensemble of characters in a book
Day 20 - Favorite kiss or love scene
Day 21 - Favorite fictional romantic relationship
Day 22 - Favorite ending/climax
Day 23 - Most annoying character
Day 24 - Best quote
Day 25 - A book you plan on reading
Day 26 - OMG WTF? plot
Day 27 - Favourite non-mainstream writer
Day 28 - First book obsession
Day 29 - Current book obsession
Day 30 - Saddest character death