Anders Hejlsberg (creator of C# programming language) about Smalltalk:

"Well, I think, one of the things that I, for example, always have liked
about Smalltalk, 
 is the notion that, in that language, everything is an object. Now, this
gives you a tremendous 
 simplification, because it doesn't matter what piece of data you're
holding, you can carry it from 
 point A to point B as an object. Anything can sort of operate on it
generically. You can put it in 
 a container, just typed as object."

See http://msdn.microsoft.com/theshow/Episode008/TranscriptText.asp for full
article.