Hitchhiker's guide to the galaxy (series) by Douglas Adams
Funniest scifi (parody) I've read.

Tales of Earthsea (series) by Ursula K. Le Guin
Awesome tales with wizards and magic.

His Dark Materials (trilogy) by Philip Pullman
Beautiful story about Lyra and Will in a fantasy setting involving daemons.

A song of Ice and Fire (series) by George R. R. Martin
Epic low-fantasy with detailed world and characters.

Bartimaeus (series) by Jonathan Stroud
A little different world with magic, very original and has many interesting characters.

Harry Potter (series) by J. K. Rowling
Magic, friendship, bravery.

Harry Potter and the Methods of Rationality (fanfic) by Eliezer Yudkowsky
Magic, science, adventure.

Darren Shan (series) aka Cirque du Freak
Great vampire series.

V for Vendetta (comic) by Alan Moore (writer) & David Lloyd (illustrator)
The best comic I've read. It became famous after a movie was made of it.

Star Wars (many books) by different authors
Excellent scifi.

The Big Sleep by Raymond Chandler
Excellent detective story.

Hyperion (cantos) by Dan Simmons
The best science fiction story I've read.

Vihreä tukka by Aila Meriluoto
Finnish fantasy about following one's heart, love and adventures.

Sinuhe the Egyptian by Mika Waltari
Historically accurate, adventurous story about a lonely man.

Soul Land by Tang Jia San Shao
Fantasy adventure story of spirit master.

Divine Throne by Tang Jia San Shao
Fantasy adventure story of a knight.