Listmania!
Supernatural YA and adult
Twilight (Twilight Saga)Twilight (Twilight Saga) by Stephenie Meyer
Buy new: £3.44 / Used from: £1.75
And the rest of the series obv, if you haven't read these where have you been?
Vampire AcademyVampire Academy by Richelle Mead
Buy new: £4.86 / Used from: £2.13
And rest of series, currently there are 4, next out Spring 2010
The Hunger Games (Hunger Games Trilogy)The Hunger Games (Hunger Games Trilogy) by Suzanne Collins
Buy new: £4.19 / Used from: £1.20
I can't say enough good things about these books, can't wait for the third.
Marked (House of Night)Marked (House of Night) by P.C. Cast
Buy new: £2.99 / Used from: £1.54
Not suitable for young teens
ShiverShiver by Maggie Stiefvater
Buy new: £4.86 / Used from: £2.46
Not finished yet, but enjoying it so far
Uglies (Uglies Quartet)Uglies (Uglies Quartet) by Scott Westerfeld
Buy new: £5.19 / Used from: £1.14
I enjoyed the first two but struggled with the third
Poison Study (Book 1 in The Study Trilogy) (MIRA)Poison Study (Book 1 in The Study Trilogy) (MIRA) by Maria V. Snyder
Buy new: £3.00 / Used from: £1.37
Only read first in the series, but enjoyed it a lot.