What I loved about Prototype (apart from changing my opinion about Javascript) was that it sort of extended the language itself, and made more possible with less. But now, I feel coffeescript is a better way to go. What I hated about Prototype was performance. And jQuery is way better there.<p>This seems to be like Firefox v/s Webkit. Prototype 2.0 is going to fix a lot of things (by not extending the DOM), but that approach is in many ways closer to jQuery.