1) The best way to say something is neat-o, awesome, or swell. The phrase "cool" is very relaxed, never goes out of style, and people will never laugh at you for using it, very conveniant for people like me who don't care about what's "in."
Homestar is cool. (http://www.urbandictionary.com/define.php?term=cool)



2) Cool is an aesthetic of attitude, behavior, comportment, appearance and style, influenced by and a product of the Zeitgeist. Because of the varied and changing connotations of cool, as well its subjective nature, the word has no single meaning. It has associations of composure and self-control (cf. the OED definition) and often is used as an expression of admiration or approval.(http://en.wikipedia.org/wiki/Cool_(aesthetic)



3)http://www.media-awareness.ca/english/resources/educational/lessons/elementary/body_image/anatomy_of_cool.cfm

4)http://www.coolhunting.com/

5) http://ardictionary.com/Cool/11949