My Dad is the biggest Ray Bradbury fan I know, and he encouraged me to read him from a very early age - I believe I started with The Machineries Of Joy. I really enjoy his short stories and I'm not, on the whole, a short story fan. His novels are great though, Something Wicked This Way Comes is way up on my list of "Books that everyone should read", it's truly fantastic.

Of his more recent (1990's/2000's) works, I really enjoyed A Graveyard For Lunatics which was a great premise for a story and very exciting to read.