Here are the ones that I can think of from the top of my head. These books are completely awsome. When/if I get the time I'll post a little something about each one.
The Inheritance Circle (Eragon, Eldest)-Christopher Paolini
Twilight series-Stephenie Meyer
Harry Potter series-JK Rowling
Pendragon series-DJ MacHale
Black series-Ted Dekker (Christian Fiction)
Artemis Fowl series-Eoin Colfer
House of Night series- PC and Kristin Cast
Inkheart series-Cornelia Funke
Stormbreaker series-Anthony Horrowitz
Guardians of Time-Marrianne Curly
The Sea of Trolls-Nancy Farmer
The House of the Scorpian-Nancy Farmer
The City of Bones- Clarrisa Clare
Maximum Ride series-James Patterson
The Chronicals of Narnia-CS Lewis
The Lord of the Rings-JRR Tolkein
Tamora Pierce Series
The Warrier Series-Erin Hunter
hmmmmmmm....that's all I can think of for now....I added the names of the authors incase you see one that sounds interesting you can find it.