Run / Universal JavaScript Animation Framework / Start Seriously, why so many new JavaScript animation frameworks? Didn't we already have enough good ones? If I were Thomas Fuchs, I'd be wondering where Script.aculo.us went wrong, because since all of these are based on prototype.js, why did other developers feel the need to do Script.aculo.us one better? Frankly, unless one of them shows really unique promise, I'm going to continue counting on Fuchs and company to add more firepower to their genre-defining JavaScript animation library. That said, Run looks pretty darn cool!