I'm not sure why I like him so much, but his roles always stick with me. "Journey to Italy" is my favorite of his movies.
Have you seen any of his "The Saint" or "Falcon" series? I really like him in "Death of a Scoundrel"
I wish I could get a copy of his autobiography "Memoirs of a Professional Cad". It's out of print and extremely expensive, but apparently he did not hold back at all with his opinions. I bet it's a great read.