And perhaps Self edit: Even though I haven't used it, Newspeak (http://newspeaklanguage.org/ http://newspeaklanguage.org/) seems really interesting as well. Th

And perhaps Self edit: Even though I haven't used it, Newspeak (http://newspeaklanguage.org/ http://newspeaklanguage.org/) seems really interesting as well. Though I'm not sure if it's still being actively developed. Gilad Bracha's blog (http://gbracha.blogspot.com/search/label/Newspeak http://gbracha.blogspot.com/search/label/Newspeak) explains a lot of the concepts. I find it especially interesting because like Smalltalk and Lisp it seems to be based on a small set of powerful primitives.