I'm not against jargon outright, but io could use some better copy, it doesn't do the language credit (its pretty cool!). The first sentence of the about page is: "Io is a homoiconic prototype-based programming language". I guess that's an accurate description... but if you're clicking "about" presumably you're making up your mind about if this is worth more of your time or not. I'm guessing even most of the brightest programmers have never even heard that word. If you know what homoiconic means you're probably the language designer, a lisp hacker, or a regular at lambda-the-ultimate.