Here's an interesting post on server-side JavaScript: http://www.sitepoint.com/blogs/2009/03/10/server-side-javascript-will-be-as-common-as-php/

The way that JavaScript naturally combines the functional and object-oriented models is what reminds me of Ruby -- although they do that in slightly different ways.

What is profound (for me) about JavaScript is the way that there's no difference between object members and array elements. An array index is really just an identifier for a member of that array object, and an object is really just an array of members (including member functions).