Dali one of the greatest .
A flamboyant painter and sometime writer, sculptor and experimental film-maker, Salvador Dali was probably the greatest Surrealist artist, using bizarre dream imagery to create unforgettable and unmistakable landscapes of his inner world. His most famous work is The Persistence Of Memory.
At one time or another I think most of us has had a poster of his work or known someone who has. A personal favorite of mine . If you ever get the chance check out a documentary on him - even if you don't like his art - the guy was one hell of a character!
A good dali site with a great gallery
http://www.virtualdali.com/
also of interest:
dali museum:
Dali - wiki