Discussion on:

Poll: Are you using or learning jQuery?

For all that it has fallen out of favour - even with the original author - I still find the OO-centric nature of Prototype much tidier and more elegant than the equivalent jQuery. For a language where objects are so central, it feels like the natural way to work.
jQuery has become so widely popular that it is not a framework that can be ignored, and it is great to see the huge array of community supplied widgets that operate as plugins. I just get a slightly hollow feeling inside when developing against it...

The back end has been largely reduced to web services serving up JSON with the bulk of the logic on the front end.